Oil cooled, decrease the heat damage of the engine,  make the longer using.

Starting could be in any gear.

Lighten piston with un-frication material, and together  with the thin piston ring, can decrease the inertia,  increasing the power output and make the using life  longer.

Special Design on crankshaft, piston, camshaft,  clutch, magnetor as the racer motorcycle, increase  the explosive force.

Lighten magnetor made by tombarthite, will never  demagnetization.

Material of clutch is anti-heat rubber, long using life.  Strength shaft can be used safely.