I have a 90 yz250 and just did the top end so i put the bike back together and fired up the first kick. there is a loud! noise sound kind of like the valves on a car ticking i shut the bike off and took the pipe off and looked in the hole at the piston i did notice that if i put my hand in there i can push the piston to the side a little this does not seem right to me. i did a compression check and i am right at 178psi don't know what this might be. :yell:
