Have a buddy who just had valves done on his kids bike. Had a local mechanic with some experience with 4 strokes reshim valves. Now he says it's hard to start, because of high compression? Says he has to get it past tdc to start it. Told him to check de-comp adjustment. He said it is within spec. Going to have him bring it to me so I can check it, de-comp is my first thought. Anyone else ever come across this??