Got an issue….last fall I lost my piston skirt due to a severe overheat during a very long, very hard technical climb. My fan didn't come on, I knew I had an issue with the thermocouple, but rode anyways. Got to the top she was blowin' steam, during a long muddy descent she came apart. I replaced the piston, inspected and cleaned out the bottom end. All looked good. Then had this motor racing issue. Like a big air-leak. Huge air-leak... It races so bad I have to put it in gear and stall it, it won't even shut off by the kill switch. Found a crack in the case from the crank smashing the piston pieces into the bottom of the case, found it by some (pre-mix) oil leaking out of the minuscule crack. Didn't see it until the oil made it visible. Tried to fix it with some good ole JB Weld. Still racing uncontrollable. When it was upside down fixing the crack, some tranny oil came out of the spark plug hole, just a drop. Figured there was another crack, like between the bottom end and the tranny. So I ended up replacing both case halves. Inspected the old cases, no crack are apparent. Just got it finished. Still have this uncontrollable racing issue, although not quite as bad, but still pretty severe... What next? Could it be one (or both) of the seals on either side of the crank? Maybe they got ruined during the over-heat? They 'looked' fine during the case replacement. Head seems flat, o-ring head gaskets look good. Cylinder cracked? Wouldn't I see steam or loss of coolant, don't see that. I'm thinking those crank seals…any input?