topend rebuilt
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I would recommend a pair of pro-x pistons. Cast pistons last alot longer and you could run tighter clearances because they do not expand as much which equals more HP.I also MX race, I hit the track about twice a week, I change my piston out every 30 gallons of gas. If you stick to this program you can get 2 or sometimes 3 pistons to a bore.
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