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Message: [QUOTE="kdxepp, post: 257137, member: 22372"] My first time refurbing a top end on an untouched 8 year old KDX 200 engine and had a couple questions for the learned. I am not replacing the piston so I was lightly scraping the carbon out of it's ring grooves and found the top groove to be much tighter than the bottom. To the point where the ring will not fit in the top groove the whole way like it does the bottom. I have scraped out some carbon from both grooves, but the top is still very tight. I am concerned that the new ring won't fit in correctly. Is the top groove purposely meant to be tighter for some reason. Any thoughts? Second question: The bore has some scratches that you can feel with your finger. I used a fine scotch bright pad on the entire bore. You can still feel the scratches. This may be hard to answer, but, how do you know when to stop using the sbright pad? How far can you go? I can see the lines from the pad in the bore, but they are not as deep as the original factory hone marks that are still left at the bottom of the cyl bore. It almost seems like I could use a more coarse pad. Also, FYI, I got the top end gasket kit from Fredette and found that the KIPS rack rod seal isn't included, There goes another week in waiting. I also found that Permatex gasket remover works even better than oven cleaner at removing carbon build up, and it doesn't corrode the aluminum, fyi. [/QUOTE]