Exhibit 3.4

CERTIFICATE OF INCORPORATION

OF

POWER SOLUTIONS INTERNATIONAL, INC.

FIRST: The name of the Corporation is Power Solutions International, Inc.

SECOND: The Corporation’s registered office in the State of Delaware is located at Corporation Trust Center, 1209 Orange Street, Wilmington, Delaware 19801, in the county of New Castle. The name of the Corporation’s registered agent at such address is The Corporation Trust Company.

THIRD: The nature of the business and the objects and purposes to be transacted, promoted and carried on are to engage in any lawful act or activity for which corporations may be organized under the General Corporation Law of the State of Delaware (the “DGCL”).

FOURTH:

A. CAPITAL STOCK

1. Authorized Stock. The total number of shares of capital stock which this corporation shall have authority to issue is fifty five million (55,000,000) shares, divided as follows: (i) fifty million (50,000,000) shares of Common Stock, par value $0.001 per share, and (ii) five million (5,000,000) shares of Preferred Stock, par value $0.001 per share.

B. DESIGNATIONS AND RIGHTS. The designations and the powers, preferences and relative, participating, optional or other rights of the capital stock and the qualifications, limitations or restrictions thereof are as follows:

1. Common Stock.

a. Voting Rights. Except as otherwise provided by law, each share of Common Stock shall entitle the holder thereof to one vote in any matter which is submitted to a vote of stockholders of the Corporation.

b. Dividends. Subject to the express terms of the Preferred Stock outstanding from time to time, such dividend or distribution as may be determined by the board of directors of the Corporation (the “Board of Directors”) may from time to time be declared and paid or made upon the Common Stock out of any source at the time lawfully available for the payment of dividends, and all such dividends shall be shared equally by the holders of Common Stock on a per share basis.

c. Liquidation. The holders of Common Stock shall be entitled to share ratably, upon any liquidation, dissolution or winding up of the affairs of the Corporation (voluntary or

involuntary), all assets of the Corporation which are legally available for distribution, if any, remaining after payment of all debts and other liabilities and subject to the prior rights of any holders of Preferred Stock of the preferential amounts, if any, to which they are entitled.

2. Preferred Stock. The Preferred Stock may be issued from time to time in one or more series, each of which series shall have such distinctive designation or title and such number of shares as shall be fixed by the Board of Directors prior to the issuance of any shares thereof. Each such series of Preferred Stock shall have such voting powers, full or limited, or no voting powers, and such preferences and relative, participating, optional or other special rights and such qualifications, limitations or restrictions thereof, as shall be stated and expressed in the resolution or resolutions providing for the issue of such series of Preferred Stock as may be adopted from time to time by the Board of Directors prior to the issuance of any shares thereof pursuant to the authority hereby expressly vested in it. The Board of Directors is further authorized to increase or decrease (but not below the number of shares outstanding) the number of shares of any series of Preferred Stock subsequent to the issuance of shares of that series. In case the number of shares of any series shall be so decreased, the shares constituting such decrease shall resume the status of which they had prior to the adoption of the resolution originally fixing the number of shares of such series. Except as provided in the resolution or resolutions of the Board of Directors creating any series of Preferred Stock or as otherwise provided herein, the shares of Common Stock shall have the exclusive right to vote for the election and removal of directors and for all other purposes.

FIFTH: Board of Directors. The business and affairs of the Corporation shall be managed by, or under the direction of, a board of directors consisting of not less than five (5) nor more than eleven (11) directors. The exact number of directors shall be determined from time to time by resolution adopted by the affirmative vote of a majority of the directors in office at the time of adoption of such resolution.

Each director shall hold office until the next annual meeting of stockholders and until his or her successor shall be elected and qualified, subject, however, to prior death, resignation, retirement or removal from office. Directors may be removed, with or without cause, by holders of shares of capital stock of the Corporation having at least a majority of the total votes represented by the outstanding shares of capital stock of the Corporation entitled to vote generally in the election of directors. Vacancies on the Board of Directors and newly-created directorships may be filled by the Board of Directors or the stockholders; provided, however, that any vacancy resulting from the removal of a director may only be filled by the stockholders.

SIXTH:

A. Written Consent. Any corporate action required or permitted to be taken at any annual or special meeting of stockholders may be taken by written consent of the holders of shares of capital stock of the Corporation having a majority of the total votes represented by the outstanding shares of capital stock of the Corporation, in lieu of a meeting.

B. Special Meetings. Special meetings of the stockholders of the Corporation may be called, upon not less than ten (10) nor more than sixty (60) days’ written notice, only (i) by the Chairman of the Board of Directors, (ii) by the Chief Executive Officer of the Corporation, (iii) by the Board of Directors pursuant to a resolution approved by a majority of the Board of Directors, or (iv) at the request in writing of stockholders owning at least twenty percent (20%) of the entire capital stock of the Corporation issued and outstanding and entitled to vote.

SEVENTH:

A. Amendment of By-Laws. In furtherance and not in limitation of the power conferred by statute, the Board of Directors is expressly authorized to make, alter, amend or repeal the By-laws of the Corporation (“By-laws”). The By-laws may be altered, amended, or repealed, or new By-laws may be adopted, by the Board of Directors in accordance with the preceding sentence or by the vote of the holders of at least a majority of the voting power of the shares of the Corporation entitled to vote generally in the election of directors at an annual or special meeting of stockholders; provided that, if such alteration, amendment, repeal or adoption of new By-laws is effected at a duly called special meeting, notice of such alteration, amendment, repeal or adoption of new By-laws is contained in the notice of such special meeting. The Board of Directors shall not have the power to amend, alter or repeal, or to adopt any provision inconsistent with, any By-law adopted by the stockholders.

B. Election of Directors. Elections of Directors need not be by written ballot unless the By-laws shall so provide.

C. Meetings of Stockholders. Meetings of stockholders may be held within or without the State of Delaware, as the By-laws may provide.

D. Books of Corporation. The books of the Corporation may be kept at such place within or without the State of Delaware as the By-laws may provide or as may be designated from time to time by the Board of Directors.

EIGHTH: The Board of Directors may adopt a resolution proposing to amend, alter, change or repeal any provision contained in this Certificate of Incorporation, in the manner now or hereafter prescribed by statute. Notwithstanding anything contained in this Certificate of Incorporation to the contrary, the affirmative vote of the holders of shares of capital stock of the Corporation having at least eighty percent (80%) of the total votes represented by the outstanding shares of capital stock of the Corporation entitled to vote generally in the election of directors shall be required to amend, alter or repeal, or to adopt any provision inconsistent with, Article Fifth, Sixth, Seventh, Eighth or Ninth of this Certificate of Incorporation.

NINTH:

A. Indemnification of Officers and Directors: The Corporation shall:

(a) indemnify, to the fullest extent permitted by the DGCL, any present or former director of the Corporation, and may indemnify any present or former officer, employee or agent of the Corporation selected by, and to the extent determined by, the Board of Directors for

indemnification, the selection and determination of which may be evidenced by an indemnification agreement, who was or is a party or is threatened to be made a party to any threatened, pending or completed action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in the right of the Corporation) by reason of the fact that such person is or was a director, officer, employee or agent of the Corporation, or is or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation, partnership, limited liability company, joint venture, trust or other enterprise, against expenses (including attorneys’ fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding if such person acted in good faith and in a manner such person reasonably believed to be in or not opposed to the best interests of the Corporation, and, with respect to any criminal action or proceeding, had no reasonable cause to believe such person’s conduct was unlawful. The termination of any action, suit or proceeding by judgment, order, settlement, conviction, or upon a plea of nolo contendere or its equivalent, shall not, of itself, create a presumption that the person did not act in good faith and in a manner which such person reasonably believed to be in or not opposed to the best interests of the Corporation, and, with respect to any criminal action or proceeding, had reasonable cause to believe that such person’s conduct was unlawful; and

(b) indemnify any present or former director of the Corporation, and may indemnify any present or former officer, employee or agent of the Corporation selected by, and to the extent determined by, the Board of Directors for indemnification, the selection and determination of which may be evidenced by an indemnification agreement, who was or is a party or is threatened to be made a party to any threatened, pending or completed action or suit by or in the right of the Corporation to procure a judgment in its favor by reason of the fact that such person is or was a director, officer, employee or agent of the Corporation, or is or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation, partnership, limited liability company, joint venture, trust or other enterprise against expenses (including attorneys’ fees) actually and reasonably incurred by such person in connection with the defense or settlement of such action or suit if such person acted in good faith and in a manner such person reasonably believed to be in or not opposed to the best interests of the Corporation and except that no indemnification shall be made in respect of any claim, issue or matter as to which such person shall have been adjudged to be liable to the Corporation unless and only to the extent that the Court of Chancery or the court in which such action or suit was brought shall determine upon application that, despite the adjudication of liability but in view of all the circumstances of the case, such person is fairly and reasonably entitled to indemnity for such expenses which the Court of Chancery or such other court shall deem proper; and

(c) indemnify any present or former director of the Corporation, and may indemnify any present or former officer, employee or agent of the Corporation selected by, and to the extent determined by, the Board of Directors for indemnification, the selection and determination of which may be evidenced by an indemnification agreement, against expenses (including attorneys’ fees) actually and reasonably incurred by such person in connection therewith, to the extent that a present or former director, officer, employee or agent of the Corporation has been successful on the merits or otherwise in defense of any action, suit or proceeding referred to in Section (a) or (b) of this Article NINTH, or in defense of any claim, issue or matter therein; and

(d) make any indemnification under Section (a) or (b) of this Article NINTH (unless ordered by a court) only as authorized in the specific case upon a determination that indemnification of the present or former director, officer, employee or agent of the Corporation is proper in the circumstances because such person has met the applicable standard of conduct set forth in Section (a) or (b) of this Article NINTH. Such determination shall be made, with respect to a person who is a director or officer at the time of such determination, (1) by a majority vote of directors who were not parties to such action, suit or proceeding, even though less than a quorum, or (2) by a committee of such directors designated by majority vote of such directors, even if less than a quorum, or (3) if there are no such directors, or if such directors so direct, by independent legal counsel in a written opinion, or (4) by the stockholders of the Corporation; and

(e) pay expenses (including attorneys’ fees) incurred by a present or former director, or by any present or former officer, employee or agent of the Corporation selected for indemnification by the Board of Directors in accordance with Section (a) or (b) of this Article NINTH, in defending a civil or criminal action, suit or proceeding in advance of the final disposition of such action, suit or proceeding upon receipt of an undertaking by or on behalf of such director or officer to repay such amount if it shall ultimately be determined that such director or officer is not entitled to be indemnified by the Corporation as authorized in Article NINTH herein; and

(f) not deem the indemnification and advancement of expenses provided by, or granted pursuant to, the other subsections of this Article NINTH exclusive of any other rights to which those seeking indemnification or advancement of expenses may be entitled under the By-laws, any agreement, any vote of stockholders or disinterested directors or otherwise, both as to action in such person’s official capacity and as to action in another capacity while holding such office or position; and

(g) have the right, power and authority to purchase and maintain insurance on behalf of any person who is or was a director, officer, employee or agent of the Corporation, or is or was serving at the request of the Corporation as a director, officer, employee or agent of another corporation, partnership, joint venture, trust or other enterprise against any liability asserted against such person and incurred by such person in any such capacity, or arising out of such person’s status as such, whether or not the Corporation would have the power to indemnify such person against such liability under the provisions of this Article NINTH and the DGCL; and

(h) continue the indemnification and advancement of expenses provided by, or granted pursuant to, Article NINTH herein, unless otherwise provided when authorized or ratified, as to a person who has ceased to be a director, officer, employee or agent of the Corporation, and the indemnification and advancement of expenses provided by, or granted pursuant to this Article NINTH shall inure to the benefit of the heirs, executors and administrators of such a person; and

The provisions of this Article NINTH shall be treated as a contract between the Corporation and each director, or appropriately designated officer, employee or agent, who serves in such capacity at any time while this Article NINTH is in effect, and any repeal or modification of this Article NINTH shall not affect any rights or obligations then existing with

respect to any state of facts then or theretofore existing or any action, suit or proceeding theretofore or thereafter brought or threatened based in whole or in part upon such state of facts; provided, however, that the provisions of this Article NINTH shall not be treated as a contract between the Corporation and any directors, officers, employees or agents of any other corporation (the “Second Corporation”) that shall merge into or consolidate with the Corporation where the Corporation shall be the surviving or resulting corporation, and any such directors, officers, employees or agents of the Second Corporation, in their capacity as such, shall be indemnified only at the discretion of the Board of Directors.

B. Elimination of Certain Liability of Directors: No director of the Corporation shall be personally liable to the Corporation or its stockholders for monetary damages for breach of fiduciary duty as a director, except for liability (i) for any breach of the director’s duty of loyalty to the Corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law, (iii) under Section 174 of the DGCL, as the same exists or hereafter may be amended, or (iv) for any transaction from which the director derived an improper personal benefit. If the DGCL is amended to authorize the further elimination or limitation of liability of directors, then the liability of a director of the Corporation, in addition to the limitation on personal liability provided herein, shall be limited to the fullest extent permitted by the amended DGCL. Any repeal or modification of this Article NINTH by the stockholders of the Corporation shall be prospective only and shall not adversely affect any limitation on the personal liability of a director of the Corporation existing at the time of such repeal or modification.

TENTH: The Corporation hereby irrevocably expressly elects not to be governed by the provisions of Section 203 of the DGCL or any successor statute of similar effect.

The undersigned incorporator hereby acknowledges that the foregoing Certificate of Incorporation is such incorporator’s act and deed and that the facts stated therein are true.

August 12, 2011