<SEC-DOCUMENT>0001193125-19-280460.txt : 20191031
<SEC-HEADER>0001193125-19-280460.hdr.sgml : 20191031
<ACCEPTANCE-DATETIME>20191031161202
ACCESSION NUMBER:		0001193125-19-280460
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20191030
ITEM INFORMATION:		Entry into a Material Definitive Agreement
ITEM INFORMATION:		Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20191031
DATE AS OF CHANGE:		20191031

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			POWER SOLUTIONS INTERNATIONAL, INC.
		CENTRAL INDEX KEY:			0001137091
		STANDARD INDUSTRIAL CLASSIFICATION:	ENGINES & TURBINES [3510]
		IRS NUMBER:				330963637
		STATE OF INCORPORATION:			IL
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35944
		FILM NUMBER:		191183782

	BUSINESS ADDRESS:	
		STREET 1:		201 MITTEL DRIVE
		CITY:			WOOD DALE
		STATE:			IL
		ZIP:			60191
		BUSINESS PHONE:		630-350-9400

	MAIL ADDRESS:	
		STREET 1:		201 MITTEL DRIVE
		CITY:			WOOD DALE
		STATE:			IL
		ZIP:			60191

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FORMAT INC
		DATE OF NAME CHANGE:	20060901

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	FORMAT INC /FA/
		DATE OF NAME CHANGE:	20010321
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>d821968d8k.htm
<DESCRIPTION>8-K
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<Center><DIV STYLE="width:8.5in" align="left">
 <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="margin-top:4pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>UNITED STATES </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>SECURITIES AND EXCHANGE COMMISSION </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Washington, D.C. 20549 </B></P> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>FORM <FONT
STYLE="white-space:nowrap">8-K</FONT> </B></P> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>CURRENT
REPORT </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>PURSUANT TO SECTION 13 OR 15(d) </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>OF THE SECURITIES EXCHANGE ACT OF 1934 </B></P>
<P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Date of Report (Date of earliest event reported): October&nbsp;30, 2019 </B></P>
<P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:24pt; font-family:Times New Roman" ALIGN="center"><B>Power Solutions International, Inc. </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(Exact name of registrant as specified in its charter) </B></P> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top" ALIGN="center"><B>Delaware</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B><FONT STYLE="white-space:nowrap">001-35944</FONT></B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B><FONT STYLE="white-space:nowrap">33-0963637</FONT></B></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:8pt">
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(State or other jurisdiction</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>of incorporation)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Commission</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>File Number)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(IRS Employer</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Identification No.)</B></P></TD></TR>
</TABLE> <P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>201 Mittel Drive, Wood Dale, Illinois 60191 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Address of principal executive offices and zip code) </B></P>
<P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Registrant&#146;s telephone number, including area code: <FONT STYLE="white-space:nowrap">(630)&nbsp;350-9400</FONT> </B></P>
<P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Check the appropriate box below if the Form <FONT STYLE="white-space:nowrap">8-K</FONT> filing is intended to simultaneously satisfy the filing obligation of
the registrant under any of the following provisions (see General Instruction A.2. below): </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">&#9744;</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) </P></TD></TR></TABLE>
<P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">&#9744;</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">Soliciting material pursuant to Rule <FONT STYLE="white-space:nowrap">14a-12</FONT> under the Exchange Act (17
CFR <FONT STYLE="white-space:nowrap">240.14a-12)</FONT> </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">&#9744;</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left"><FONT STYLE="white-space:nowrap">Pre-commencement</FONT> communications pursuant to Rule <FONT
STYLE="white-space:nowrap">14d-2(b)</FONT> under the Exchange Act (17 CFR <FONT STYLE="white-space:nowrap">240.14d-2(b))</FONT> </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">&#9744;</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left"><FONT STYLE="white-space:nowrap">Pre-commencement</FONT> communications pursuant to Rule <FONT
STYLE="white-space:nowrap">13e-4(c)</FONT> under the Exchange Act (17 CFR <FONT STYLE="white-space:nowrap">240.13e-4(c))</FONT> </P></TD></TR></TABLE>
<P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Securities registered pursuant to Section&nbsp;12(b) of the Act: </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="bottom" NOWRAP ALIGN="center" STYLE="border-bottom:1.00pt solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Title of each class</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="border-bottom:1.00pt solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Trading</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Symbol(s)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="border-bottom:1.00pt solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Name of each exchange</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>on which registered</B></P></TD></TR>


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<TD VALIGN="top" ALIGN="center"><B>None</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>&#151;&nbsp;&nbsp;</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>&#151;&nbsp;&nbsp;</B></TD></TR>
</TABLE> <P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of
1933 (&#167;230.405 of this chapter) or Rule <FONT STYLE="white-space:nowrap">12b-2</FONT> of the Securities Exchange Act of 1934 <FONT STYLE="white-space:nowrap">(&#167;240.12b-2</FONT> of this chapter). </P>
<P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right">Emerging growth company&nbsp;&nbsp;&#9744; </P> <P STYLE="margin-top:10pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">If an
emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section&nbsp;13(a) of the Exchange
Act.&nbsp;&nbsp;&#9744; </P> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P> <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;1.01 Entry into a Material Definitive Agreement. </B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><I>Fifth Supplemental Indenture </I></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">On October&nbsp;30, 2019,
Power Solutions International, Inc. (the &#147;Company&#148;) entered into a fifth supplemental indenture (the &#147;Fifth Supplemental Indenture&#148;) to the indenture (&#147;Indenture&#148;) governing its $55.0&nbsp;million 6.50% senior notes
maturing January&nbsp;1, 2020 (the &#147;Notes&#148;). The Fifth Supplemental Indenture (a)&nbsp;extends the maturity of the Notes until June&nbsp;30, 2020 and (b)&nbsp;amends the definition of &#147;Interest Payment Date&#148; in the Indenture such
that any unpaid accrued interest will be due and payable at the extended maturity date. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The foregoing description of the Fifth Supplemental Indenture is
not complete and is qualified in its entirety by reference to the Fifth Supplemental Indenture, a copy of which is attached hereto as Exhibit 4.1, and is incorporated herein by reference. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The Company continues to work in concert with Weichai Power Co., Ltd., its strategic investor and collaboration partner, on the refinancing of its debt. The
extension of the Notes maturity to June&nbsp;30, 2020 provides the Company with additional time to explore various refinancing opportunities. </P>
<P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;2.03 Creation of a Direct Financial Obligation or an Obligation under an <FONT STYLE="white-space:nowrap">Off-Balance</FONT> Sheet Arrangement of
a Registrant. </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The information provided in Item&nbsp;1.01 of this Form <FONT STYLE="white-space:nowrap">8-K</FONT> is incorporated herein by reference.
</P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Caution Regarding Forward-Looking Statements </B></P> <P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">This
Form <FONT STYLE="white-space:nowrap">8-K</FONT> contains forward-looking statements regarding the current expectations of the Company about its prospects and opportunities. These forward-looking statements are entitled to the safe-harbor provisions
of Section&nbsp;21E of the Securities Exchange Act of 1934. The Company has tried to identify these forward-looking statements by using words such as &#147;anticipate,&#148; &#147;believe,&#148; &#147;budgeted,&#148; &#147;contemplate,&#148;
&#147;estimate,&#148; &#147;expect,&#148; &#147;forecast,&#148; &#147;guidance,&#148; &#147;may,&#148; &#147;outlook,&#148; &#147;plan,&#148; &#147;projection,&#148; &#147;should,&#148; &#147;target,&#148; &#147;will,&#148; &#147;would,&#148; or
similar expressions, but these words are not the exclusive means for identifying such statements. These statements are subject to a number of risks, uncertainties, and assumptions that may cause actual results, performance or achievements to be
materially different from those expressed in, or implied by, such statements. The Company cautions that the risks, uncertainties and other factors that could cause its actual results to differ materially from those expressed in, or implied by, the
forward-looking statements, include, without limitation: management&#146;s ability to successfully implement the Audit Committee&#146;s remedial recommendations; the time and effort required to complete its delinquent financial statements and
prepare the related Form <FONT STYLE="white-space:nowrap">10-K</FONT> and Form <FONT STYLE="white-space:nowrap">10-Q</FONT> filings; the timing of completion of necessary interim reviews and audits by the Company&#146;s independent registered public
accounting firm; the timing of completion of steps to address, and the inability to address and remedy, material weaknesses; the identification of additional material weaknesses or significant deficiencies; variances in <FONT
STYLE="white-space:nowrap">non-recurring</FONT> expenses; risks relating to the substantial costs and diversion of personnel&#146;s attention and resources deployed to address the financial reporting and internal control matters and related class
action litigation; the ability of the Company to accurately budget for and forecast sales, and the extent to which sales result in recorded revenues; the impact of the investigations being conducted by United States Securities and Exchange
Commission (&#147;SEC&#148;), and the criminal division of the United States Attorney&#146;s Office for the Northern District of Illinois (&#147;USAO&#148;) and any related or additional governmental investigative or enforcement proceedings; any
delays and challenges in recruiting key employees consistent with the Company&#146;s plans; any negative impacts from delisting of the Company&#146;s Common Stock from the NASDAQ Stock Market and any delays and challenges in obtaining a <FONT
STYLE="white-space:nowrap">re-listing</FONT> on a stock exchange; and the risks and uncertainties described in reports filed by the Company with the SEC, including without limitation its Annual Report on Form
<FONT STYLE="white-space:nowrap">10-K</FONT> for the fiscal year ended December&nbsp;31, 2017. The Company&#146;s forward-looking statements are presented as of the date hereof. Except as required by law, the Company expressly disclaims any
intention or obligation to revise or update any forward-looking statements, whether as a result of new information, future events or otherwise. </P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>Item&nbsp;9.01 Financial Statements and Exhibits. </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">(d) Exhibits </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; border-bottom:1.00pt solid #000000; display:table-cell; font-size:8pt; font-family:Times New Roman; " ALIGN="center"><B>Exhibit&nbsp;No.</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" NOWRAP ALIGN="center"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; border-bottom:1.00pt solid #000000; display:table-cell; font-size:8pt; font-family:Times New Roman; " ALIGN="center"><B>Description</B></P></TD></TR>


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<TD VALIGN="top" NOWRAP>4.1</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top"><A HREF="d821968dex41.htm">Fifth Supplemental Indenture, dated as of October&nbsp;30, 2019, by and among Power Solutions International, Inc., The Bank of New York Mellon, as Trustee, and the Guarantors party thereto. </A></TD></TR>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>SIGNATURES </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned
hereunto duly authorized. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
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<TD VALIGN="top" COLSPAN="3">POWER SOLUTIONS INTERNATIONAL, INC.</TD></TR>
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<TD VALIGN="top">By:</TD>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Charles F. Avery, Jr.</P></TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Charles F. Avery, Jr.</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">Chief Financial
Officer</P></TD></TR>
</TABLE></DIV> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Dated: October 31, 2019 </P>
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<TYPE>EX-4.1
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<DESCRIPTION>EX-4.1
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<Center><DIV STYLE="width:8.5in" align="left">
 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B>Exhibit 4.1 </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="right"><B></B><B><I>Execution Copy</I></B><B> </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>FIFTH SUPPLEMENTAL INDENTURE </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman"><B>FIFTH SUPPLEMENTAL INDENTURE </B>(this &#147;<B>Fifth Supplemental Indenture</B>&#148;), dated as of October&nbsp;30, 2019, among Power
Solutions International, Inc., a Delaware corporation (the &#147;<B>Company</B>&#148;), the Guarantors party hereto (the &#147;<B>Guarantors</B>&#148;) and The Bank of New York Mellon, as trustee (the &#147;<B>Trustee</B>&#148;), to the Indenture,
dated as of April&nbsp;29, 2015, as amended prior to the date hereof, among the Company, the Guarantors party thereto, and the Trustee (as amended, supplemented or otherwise modified from time to time, the &#147;<B>Indenture</B>&#148;). </P>
<P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>W I T N E S S E T H </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">WHEREAS, the Company and the Guarantors have heretofore executed and delivered the Indenture providing for the issuance by the Company of its
6.50% Senior Notes maturing January&nbsp;1, 2020 (the &#147;<B>Securities</B>&#148;); </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">WHEREAS, the Company and the Guarantors desire to
execute and deliver this Fifth Supplemental Indenture to the Indenture to, among other things, amend certain provisions; </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">WHEREAS, the
Company has solicited the Holders (as defined in the Indenture) to direct the Trustee to execute and deliver this Fifth Supplemental Indenture to the Indenture to effect the amendments to the Indenture contemplated hereby; </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">WHEREAS, pursuant to Section&nbsp;9.02 of the Indenture, the parties hereto are authorized to execute and deliver this Fifth Supplemental
Indenture to amend the Indenture with the consent of the Holders of all of the Securities Outstanding (the &#147;<B>Requisite Consents</B>&#148;); </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">WHEREAS, Requisite Consents have been received from Holders of all the Securities Outstanding (as defined in the Indenture); </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">WHEREAS, the Trustee has received an Opinion of Counsel (as defined in the Indenture) and an Officers&#146; Certificate (as defined in the
Indenture) stating that the execution of this Fifth Supplemental Indenture (a)&nbsp;is permitted under the Indenture in accordance with Section&nbsp;9.03 of the Indenture and (b)&nbsp;does not violate the provisions of any agreement or instrument
evidencing any Indebtedness of the Company, any Guarantor or any other Restricted Subsidiary (as defined in the Indenture); and </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">WHEREAS,
all other conditions precedent provided under the Indenture have been complied with to permit the Company, the Guarantors and the Trustee to enter into this Fifth Supplemental Indenture. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt and adequacy of which is hereby
acknowledged, the Company, the Guarantors and the Trustee mutually covenant and agree as follows for the equal and ratable benefit of the Holders as follows: </P>
<P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>ARTICLE ONE </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>DEFINITIONS
</B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;1.1 <U>Defined Terms</U>. Capitalized terms used herein without definition shall have the meanings ascribed to them in
the Indenture. The words &#147;<B>herein</B>,&#148; &#147;<B>hereof</B>&#148; and &#147;<B>hereby</B>&#148; and other words of similar import used in this Fifth Supplemental Indenture and the Indenture refer to this Fifth Supplemental Indenture and
the Indenture as a whole and not to any particular section hereof. </P> <P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>ARTICLE TWO </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>AMENDMENTS TO THE INDENTURE </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;2.1 <U>Amendment to the Definitions</U>. </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:9%; font-size:10pt; font-family:Times New Roman">(a) Section&nbsp;1.01 of the Indenture is amended to add the following defined term: </P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">&#147;<U>Fifth Supplemental Indenture</U>&#148; means the Fifth Supplemental Indenture to this Indenture, dated as of
October&nbsp;30, 2019. </P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:9%; font-size:10pt; font-family:Times New Roman">(b) The definition of &#147;Interest Payment Date&#148; in Section&nbsp;1.01 of the
Indenture is amended and restated in its entirety and replaced by the following: </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:4%; text-indent:4%; font-size:10pt; font-family:Times New Roman">&#147;<U>Interest Payment Date</U>&#148;
means the Stated Maturity of an installment of interest on the Securities and shall include the date of Maturity of the Securities to the extent interest on the Securities accrued since the most recent Interest Payment Date remaining unpaid at
Maturity. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;2.2 <U>Extension of Maturity of the Securities</U>. The Maturity of the Securities is hereby extended from
January&nbsp;1, 2020 to June&nbsp;30, 2020 and all references in the Indenture and the Securities to a Maturity of January&nbsp;1, 2020 shall be amended to read &#147;June 30, 2020.&#148; </P>
<P STYLE="margin-top:24pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>ARTICLE THREE </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>MISCELLANEOUS </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;3.1 <U>Effectiveness</U>. This Fifth Supplemental Indenture shall become binding and effective upon execution. The provisions of
Article Two of this Fifth Supplemental Indenture shall become operative upon payment of (a)&nbsp;the Consent Fee (as defined in the Letter Agreement (the &#147;<B>Consent Agreement</B>&#148;), dated as of the date hereof, among the Company,
Osterweis Strategic Income Fund and Osterweis Strategic Investment Fund) and (b)&nbsp;the reasonable fees and expenses of the Trustee (including, but not limited to, the reasonable,
<FONT STYLE="white-space:nowrap"><FONT STYLE="white-space:nowrap">out-of-pocket</FONT></FONT> legal fees and expenses), as evidenced to the Trustee by an Officers&#146; Certificate. Upon execution and delivery of this Fifth Supplemental Indenture,
the Indenture shall be modified, amended and supplemented in accordance with this Fifth Supplemental Indenture, and all the terms and conditions of both shall be read together as though they constitute one instrument, except that, in the case of
conflict, the provisions of this Fifth Supplemental Indenture will control. In the case of a conflict between the terms and conditions contained in the Securities and those contained in the Indenture, as modified, amended and supplemented by this
Fifth Supplemental Indenture, the provisions of the Indenture, as modified, amended and supplemented by this Fifth Supplemental Indenture, shall control. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;3.2 <U>Ratification of Indenture; Supplemental Indentures Part of Indenture</U>. Except as expressly amended hereby, the
Indenture is in all respects ratified and confirmed and all the terms, conditions and provisions thereof shall remain in full force and effect. This Fifth Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder
of Securities heretofore or hereafter authenticated and delivered shall be bound hereby. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;3.3 <U>Severability</U>. In case
any provision in this Fifth Supplemental Indenture shall be invalid, illegal or unenforceable, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby and such provision shall be
ineffective only to the extent of such invalidity, illegality or unenforceability. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;3.4 <U>Governing Law</U>. THE LAWS OF THE
STATE OF NEW YORK SHALL GOVERN AND BE USED TO CONSTRUE THIS FIFTH SUPPLEMENTAL INDENTURE. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;3.5 <U>Waiver of Jury Trial</U>.
EACH PARTY HERETO HEREBY IRREVOCABLY WAIVES, TO THE EXTENT PERMITTED BY APPLICABLE LAW, ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS FIFTH SUPPLEMENTAL INDENTURE, THE INDENTURE, THE SECURITIES, THE
GUARANTEES OR THE TRANSACTIONS CONTEMPLATED HEREBY. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;3.6 <U>Counterparts</U>. The parties may sign any number of copies of
this Fifth Supplemental Indenture (including by electronic transmission). Each signed copy shall be an original, but all of them together represent the same agreement. The exchange of copies of this Fifth Supplemental Indenture and of signature
pages by facsimile or PDF transmission shall constitute effective execution and delivery of this Fifth Supplemental Indenture as to the parties hereto and may be used in lieu of any original Fifth Supplemental Indenture for all purposes. Signatures
of the parties hereto transmitted by facsimile, PDF or electronic transmission shall be deemed to be their original signatures for all purposes. </P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 2 - </P>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;3.7 <U>Effect of Headings</U>. The Section headings herein are for convenience
only and shall not affect the construction hereof. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Section&nbsp;3.8 <U>Trustee</U>. The Trustee shall not be responsible in any manner
whatsoever for or in respect of the validity or sufficiency of this Fifth Supplemental Indenture or for or in respect of the recitals contained herein, all of which recitals are made solely by the Guarantors and the Company. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>[SIGNATURE PAGES FOLLOW] </B></P>
 <p STYLE="margin-top:0pt;margin-bottom:0pt ; font-size:8pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">- 3 - </P>

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 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">IN WITNESS WHEREOF, the parties hereto have caused this Fifth Supplemental Indenture to be
duly executed and attested, all as of the date first above written. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
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<TD VALIGN="top" COLSPAN="3">The Company:</TD></TR>
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<TD HEIGHT="16" COLSPAN="3"></TD></TR>
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<TD VALIGN="top" COLSPAN="3"><B>P<SMALL>OWER</SMALL> S<SMALL>OLUTIONS</SMALL> I<SMALL>NTERNATIONAL</SMALL>, I<SMALL>NC</SMALL>.</B></TD></TR>
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<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Charles F. Avery, Jr.</P></TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Name: Charles F. Avery, Jr.</TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Title: Chief Financial Officer</TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Address: 201 Mittel Drive</TD></TR>
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<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; text-indent:2.00em; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wood Dale, Illinois 60191</P></TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Telephone: (630) 350-9400</TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">E-mail address: Chip.Avery@psiengines.com</TD></TR>
</TABLE></DIV> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">[<I>Signature Page to Fifth Supplemental Indenture</I>] </P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">IN WITNESS WHEREOF, undersigned Guarantors join in this agreement for the purpose of
agreeing to the Guarantees stated in Article Thirteen of the Indenture. </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><DIV ALIGN="right">
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<TD VALIGN="top" COLSPAN="3"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>THE W GROUP, INC.</B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>POWER
SOLUTIONS, INC.</B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>PROFESSIONAL POWER PRODUCTS, INC.</B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>POWER GREAT LAKES, INC.</B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>PSI INTERNATIONAL, LLC</B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>XISYNC LLC</B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B>POWERTRAIN INTEGRATION ACQUISITION,
LLC</B></P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman"><B>BI-PHASE TECHNOLOGIES, LLC</B></P></TD></TR>
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<TD HEIGHT="16" COLSPAN="2"></TD></TR>
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<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ Charles F. Avery, Jr.</P></TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Name: Charles F. Avery, Jr.</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Title: Chief
Financial Officer</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Address: 201 Mittel Drive</P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:2.00em; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Wood Dale, Illinois 60191</P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">Telephone: (630) 350-9400</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">E-mail address:
Chip.Avery@psiengines.com</P></TD></TR>
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<TD VALIGN="top" COLSPAN="3">THE BANK OF NEW YORK MELLON, as Trustee</TD></TR>
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<TD VALIGN="top">By:</TD>
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<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ LAURENCE J O&#146;BRIEN</P></TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Name: LAURENCE J O&#146;BRIEN</TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Title: VICE PRESIDENT</TD></TR>
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