If you wanted mods now would be the time to do them. If your happy with the stock performance then by all means go back stock. From the looks of the cylinder it appears it was washed with fuel. I just done a customers buggy this past weekeng and his cyl looked the same. His problem was the vacume operated pump went bad and fuel was flowing therough the vacume side of pump directly into the intake. If your oil smells like fuel this is why. Also sometime if the choke is not working the engine will flood when warm. The bigbore alone will not make a performance difference unless you upgrade the head and cam, mainlt the head. If eng. was washed with fuel you will probably also have badly worn guides, timing chain and oil pump. So while its down check it all out. Crank should not be a problem since it rides on roller bearings.
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