Question about 2002 Triumph Bonneville America

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Backfire louldly on deceleration

Triumph starts easily,revs cleanly but soon as throttle is released to decelerate very loud backfire occurs,would spark plugs be the cause of this as they have not been replaced for quite a while,any ideas would be much appreciated,thank you.

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One of the carburetors could be sucking in air through the vacuum port. Had a similar issue on a thruxton. Triumph puts a rubber cover on them. Sometimes the rubber cracks and sometimes the covers just fall off.

Posted on Jun 12, 2014

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Posted on Jan 02, 2017

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SOURCE: Triumph TT600 stalls during deceleration

under your air box on left side is kind of a round canister pretty small called stepper motor has 4 vacuum lines one from each carb annd 3/8 hose that runs up to air box usually 3/8 hose comes loose or falls off has to have good seal you can tell if its working look in from left side of bike through fairing when idling should see four vacuum lines pulsing if not check 3/8 hose and vacuum lines if all are intacked its probably the stepper motor they are two peice has teflon piston inside if bike ever went down oil goes int airbox down 3/8 hose into it and gumms it up run about $50

Posted on Apr 21, 2009

  • 79 Answers

SOURCE: Misfire and backfire at low rpm, runs rough at low

I would run a compresion test on it first

Posted on Feb 01, 2011

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