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Message: [QUOTE="Ol'89r, post: 1248818, member: 17212"] Patman is correct. The ports on modern day fourstroke engines are pretty good from the factory. Usually, they only require a little clean-up. Extensively modifying your ports can result in losing power if you don't know what you are doing. You would be better off to install a stage-1 camshaft and do a proper valve job to insure the head is sealing. And possibly a higher compression piston. There are several on this site that 'know how to do it' but, this is something that cannot be taught in a few minutes over the internet. [/QUOTE]