Im gonna be picking up a used cylinder and piston to fix one of mine that got scored.. my first question is.. are the cylinders the same on all the 750s? mine is a 93 and im just wondering if one off a 92 or 94 will work? i know they did some changes to the motor from 92 to 93 just not exactly sure what!... My next question is i have about 100-105 psi compression on the other 3 cylinders and my cocern is that if i put a used cylinder and piston and re ring that used piston that it will be higher than the other 3 since its got a new ring on it! Is this anything to be worried about or should i just put new rings on the other 3 while im at it? Or just not worry bout it?