Posted November 3, 201113 yr hi guys i have a yamaha aerox 2003 100cc, the bike will only do 20mph at 6,000 revs.i have no idea why i have changed the rollers,belt clutch and carb. and it is still doing the same thing. the bike normally does 60mph.i have changed the exhaust to a viper exhauset tooo. please help thanks
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