Last night I found that my QT50's piston was locked in place, this bike as been sitting in storage for over 15 years (unforunatly with a full tank of gas, yuck)
After removing the head and cyclinder I was able to get the piston free. I've clean any carbon off the piston from the inside of the cyclinder, but can't get the piston to fit back inside the cyclinder. It's almost like the rings have expanded. Any hints on how to get these parts working together again? Is it possible for the rings to have expanded over the years?