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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
05 YZ250 Powervalve
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[QUOTE="christopher in tam, post: 987943, member: 59165"] Arent the sub exhaust ports on the YZ250's opened by exhaust back pressure? Meaning the are not controled by the powervalve activator lever! I havent had mine apart yet but my brother (who has always owned YZ's) was mumbling about something about exhaust backpressure and the sub ports in relation. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
05 YZ250 Powervalve
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