150cc Engine Parts

There are two 150cc piston sizes, 57mm and 57.4. Your piston, rings, and cylinder must all match one size (as a set) in order to fit properly. The 57mm bore is known to be used in go karts with Howhit engines. 

Known 57mm engines: Yerf Dog GX150 (w/ HOWHIT), Baja Dune 150, Crossfire 150.

Known 57.4mm engines: Yerf Dog CUV.

If your kart is not listed here, please check the bore size of your cylinder with the original manufacturer. 

Howhit bore: 57.0mm (147.5 CC)

Standard bore: 57.4mm (149.8 CC)

If your piston size is 57mm, the larger 57.4 components can be used as a set (piston, rings, & cylinder). This will bump the engine displacement up 2.3CC's.