someone gave me a eton txl-50 quad for my kids. it didnt run. the starter was shot and he didnt have the kick start on it. so ive got everything taken apart and im ordering the parts i need. i decided to take the head off to make sure there was no problems there. when i got the head off the piston looks fine, but the is a hole right in the center of the piston. it is a small hole and does not go through the piston.it looks like the piston was machined that way. it doesnt look like a burn hole but a hole that was driled in to the piston. i will order a upper end kit if i have to, but if the hole is supposed to be there i wont bother spending the 150 dolars on the upper end kit. anyone know