Re: what did you do to your motorized bicycle today?
I did the piston skirt trim on one of my engines, what I did was remove the intake and use a sharpie to mark the piston where it needed to be trimmed. 2 door gave me some tips on what to do, don't remove more than you need to and don't trim the exhaust side. Removing too much will affect the balance of the crankshaft system.
Your results may not be the same,Greg