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Yamaha MX & Off-Road Dirt Bikes
mystery pro circuit silencer, will i need to rejet? (YZ250)
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[QUOTE="frostage, post: 1431080, member: 124325"] With the stock expansion chamber things shouldn't change too much, but you should always check your running the right mix if you want the best out of the bike after any changes, even a noticeable change in weather can affect the running of a bike due to density of air [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
mystery pro circuit silencer, will i need to rejet? (YZ250)
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