460cc Go Kart Racing Engine - DIY Assembly
These engines are custom made to our specifications and are the only 458cc Honda GX390 "big bore clones" available for purchase in the United States.
- Heavy Duty 10-Bolt Engine Block (Modified Extra-Thick & Reinforced Casting) - The strongest clone engine block on the market!
- 92mm Bore x 69mm Stroke
- Billet 4.51" Rod w/Bearing
- Flat Top Piston (~10:1 Compression)
- 24mm 3-Circuit Carburetor (Will need to be jetted to local climate)
- 35lb HD Valvesprings
- Cut-To-Length Chromoly Pushrods
- 1.1:1 Shaft Rockers
- Uses all GX390 Performance Parts (Cams, Valvetrain, etc)
- Electric Starter NOT included (Block has all provisions to install one, Flywheel has starter ring.)
The builder kits are designed for those who are advanced or experienced engine builders. We can only provide minimal tech support.