Originally Posted by
speedracer1bp
Just food for thought: I had the Same problem twice with same engine. Fortunately I was at a race which Rody Roem was attending. Rody explained to me that a broken skirt is usually caused by a worn crank pin. He explained that with a worn pin at high RPMs the resonance travels through the rod to the piston and skirt and will cause it to crack. Made since to me as it happened to twice to the same engine.
I can see the logic in this and all of the motors were in need of new rods but I didn't think they were that bad. It's a shame no one make after market pistons and rods for these little motors.