I was riding pretty hard the other day when I heard a grinding noise. I pulled over and the engine wound down and died as I came to a stop, wasn't able to restart so I walked it home, pulled off the head and found this disaster.
My current working theory is that one of the lower stud bolts came loose and caused an air leak. Thought I'd post the pic up here though to see if it was something else so I don't make the same mistake when I rebuild, anyone have any thoughts?
Was running an A35 45mm 70cc alukit with a matching high compression head and a Malossi 4-petal reed intake with a 19mm PHBG and a Homoet exhaust. Planning to rebuild the same.
2 sub questions:
I haven't pulled the cylinder off yet to survey any damage to the sides of the piston but should I worry about any of those chunks from the piston having made their way into the crankcase or are they likely somewhere in my exhaust or on the street?
The head kind of looks like the top of the piston, all pitted and rough, but with no chunks missing. Should I replace the head with new one or am I alright to keep running it? Treats is out of new high-heads but I've got the old stock head laying around if that would work as well.