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Dirt Bike Brands - Other
pistons for 250f...
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[QUOTE="bashn, post: 135208, member: 20847"] I don't know why your so obsessed with your top end. Tear it down down once a season for complete inspection. Replacing the piston once a season wether it needs it or not is good insurance against catastrophic failure due to cracking or hidden flaws. If your name is Tim Ferry, then by all means replace your top end every 5 hours! An easy way to check your top end is to bring the piston up to the compression stroke and rest the wieght of your leg on the kick starter. It shouldn't move for a couple seconds. If it moves quickly or hisses, then you should definately look at your valves and piston/rings/cylinder. This isn't very scientific, but you can do it every time you ride, and you will have a clue as to the general condition of your engine. Personally, I think 5 hours is ludicrous. Mark Boyd '01 YZ267 [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
pistons for 250f...
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