I have a 2000 XR100R that I just put a new piston and rings in. But no oil getting to the top. I believe gaskets are right because they are Honda gaskets and some holes are bigger to make room for dowel pins... So I don't think I could of flip them over. But who knows. It states in the Honda book to unscrew the bolt by the spark plug to see if top end is getting oil. I took the bolt completely out and the only time oil came out was when I revved it. So it is getting some oil... but not right amount, I think? I read somewhere about priming the oil pump? Can anyone tell me about that?