2004 Yamaha XT 660 R Logo
Posted on Jan 10, 2010
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Raptor 660 2003 choke on bike idles good but when off the bike starts to back fire

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  • Posted on Jan 11, 2010
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Your bike is running too lean. If you have not made any changes to the air intake or exhaust then your pilot jet may have something blocking it. (probably a piece of dirt, or just tarnish build up of fuel if the carbs aren't drained while in storage) By turning the choke on, you are reducing the ammount of air allowed into the "Fuel / Air" Mixture. This allows the bike to idle properly. Once the choke is off, the mixture has too much air and not enough fuel causing the backfire. If you haven't changed anything like the exhaust or air filter it sounds like a good carb cleaning is in order. Otherwise, you will need to change jet sizes to accomodate the difference in air flow.

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Please vote

thanks

a
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