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Message: [QUOTE="2-strokes-4-life, post: 986938, member: 59519"] we did replace the head with a brand new one.the cylinder was bored and the new piston was bought befor the shop bored it.QKENUF4U you are right,we should have replaced the cam,valves and rockers when we did it.he did lap the valves,but they probably should be replaced as well along with the springs.i will go ahead and replace the valve stem seals as well.now that im older i will at least have a better concept of whats going on when we start working on it again.i will start by replacing the above mentioned parts along with getting a service manual befor we start tearing it apart.i was thinking maybe it could have been bored wrong.what do i use to measure the bore and where can i get it?also how do you check ring gap? [/QUOTE]