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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
yz250 engine part?
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[QUOTE="RubenCR, post: 1183522, member: 76977"] have you looked at the side of the cylinder there should be two housing blocks on each side one may be behind your expansion chamber (front pipe) and theres two powervalves which act like a gate and move outwards allowing more burnt gases out at higher revs. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
yz250 engine part?
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