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backfire when throttleing down "05 venture


anzactm

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Are the exhausts stock?

 

Any changes to the stock baffles can cause exhaust popping that is both unharmful and incurable ... It might hurt the ears.

 

If it is stock, and has just started then you are getting air where no air needs to be "popping", or unburned gas exhausting "back-fiing"

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Often times a carb sync will reduce or eliminate this problem. However, if there are leaks in the exhaust system, this can cause it also.

 

Get together with another member here and have the carbs synced. There are several of us that have the tools and gauges to do it. Takes about 15 minutes and 6 beers.

 

RR

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First sync the carbs. Second make sure there are no leaks where air can enter the exhaust. Third repair or remove the AIS.

 

If it is the AIS system. Make sure both vacuum lines are connected. Determine which side is popping. Check the AIS hoses. Repair the air valve diaphragm. Or as some have done, remove the system.

 

As a side note for those who are curious.

During normal operation the AIS system allows the bike to siphon air into the exhaust. This causes excess emissions to be burned off in the exhaust. During deceleration extra fuel is available in the exhaust. So the AIS system turns off to avoid little mini explosions we call popping. High vacuum produced during deceleration is fed to the air valve diaphragm which overcomes spring pressure and closes the air passage to the exhaust.

 

 

Mike

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