Hi,
A 139 cc Chonda has found its way to my workshop. It was running very well but my grandson run it at full throttle into block of solid concrete. It stopped it of course. But now it seems to have very little compression. It still turns over and the crankshaft is not broken. Seems like the valve gear has suffered catastrophic failure. Still fires but seemingly when exhaust valve is open.
I think it's a lost cause. Anyone have any idea. By the way it has a cutter bar not a disc.
Jeff
