Information: I bought a new piston and runned it about 8 hours and then the piston got broke. Damn! I is only to apart the engine to remove all the bits of the broken piston.
But i had 8 hours of driving before it got broke. On low RPM it runs like a moped but suddenly on some specific RPM (8000-9000 rpm) it just runs away like a rocket, like a roller coaster when you suddenly come on a slope.It stays on the "rocket rpms" beetween the gearings and then it accelerates like hell.