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Jul 14, 2004 | 03:29 PM

hellboy2004

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Weekend Warrior

Joined: Apr 2004

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Backfire

Can anyone give me a reason why a good running bike will start to backfire all of a sudden. Only when I let off the throttle in gear ? ( new plug)

Jul 14, 2004 | 03:38 PM

HoundDog06

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Backfire

Sounds like a lean condition. What kind of filter are you running?

~HoundDog

Jul 14, 2004 | 05:17 PM

sAyIt_fmf

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Backfire

What kind of bike? Maybe it's time for a valve adjustment.

Jul 14, 2004 | 06:05 PM

hellboy2004

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Weekend Warrior

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Posts: 22

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Backfire

Just a stock filter HoundDog. Bike ran fine all winter. 99 Grizzly 600. Seems to be running worse in the warmer weather ?

Jul 14, 2004 | 06:07 PM

hellboy2004

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Weekend Warrior

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Backfire

Its a 99 Grizzly 600 fmf. Will valves cause backfire? I'm also noticing a little blue smoke with the throttle.

Jul 14, 2004 | 08:46 PM

pinheadedjoker

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Backfire

the warmer it is the leaner you will be running.. id check ur jets..

Jul 15, 2004 | 09:49 AM

sAyIt_fmf

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Backfire

Yes...valves out of adjustment can cause a bit of smoke. Did you change the jetting for winter? It does show symptoms of being lean as well.

Does it clear up any if you run with a partial choke on?

Backfire

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