Ideal for the guy that wants to build their own gokart with suspension or modify a old kart or buggy . Swingarm outside dimension is 25" Works with most all the popular small gas engines. Honda GX200 GX240 GX270 GX340 GX390 Predator: 212, 224, 301, 420, 459 and many more. Works well with a 1" or 1-1/4" live axle. Comes with engine cradle, swingarm, 3/4" Jackshaft with bearings and chain adjuster. Also comes with rear axle bearing weld on bearing mount plates not pictured ( will need to know your bearing mount pattern)