This engine is tuned and modified as follows by us:

- no rpm limiter
- lighter Aluminium piston UT2
- crankshaft with oil centrifuge (better lubrication for the conrod and crankshaft)
- performance camshaft
- bigger intake and exhaust valve kit with retainer and keys
- stronger valve springs (extra hard)
- cylinderhead tuning complete with higher compression
- Bronze valves guides
- modified original flywheel: light and balanced to 3 kg
- CDI ignition system
- special intake with Ø 33mm Mikuni-Carburetor and K&N air cleaner
- petrol pump with mounting plate and petrol pipes at the engine
- V2A exhaust manifold Ø 35 mm
- Amsbeck clutch 110mm with sprocket holder M24x1,5
- engine cover

Note: This engine is no longer available with Bing carburetor!

Video: Test run of a Honda GX390 engine with 26 HP: