Every gasoline engine installed in a vessel after April 25, 1940, except an outboard motor, shall be equipped with an acceptable device to control backfire flame. The device shall comply with all of the following:(A) Be securely attached to the air intake with a flame-tight connection;(B) Be in proper working order;(C) Be coast guard approved or comply with either SAE J1928 or UL 1111;(D) Be marked to indicate approval or compliance under division (C) of this section.
Backfire flame control device
Ohio Rev. Code Ann. § 1547.28, under Chapter 1547 | Watercraft And Waterways.
Ohio Rev. Code Ann. § 1547.28