2017 yxz1000r with aftermarket exhaust and a/f controller backfires when decelerating at higher speeds. Occasionally engine cuts out until I downshift.

Colin Stickland

• 22516 Answers
• Posted on Nov 20, 2008

SOURCE: 2007 Lincoln MKZ Transmission goes CLUNK on low speed downshift

sounds like an electronic fault caused by the mini computer controling the gearbox functions,try another dealer as dealer only as good as the mechanics it employs.and like the old adage if you only pay peanuts you only get monkeys.but thinking about it ,their is a possibility of a piston sticking in the box thats controling the brake bands.buy a manual next time

SOURCE: backfires during deceleration

Check a spark plug for color. A white plug means that it's too lean (Not enough fuel) They will pop when lean on decel!

SOURCE: backfiring on deceleration from exhaust pipes

May be running too lean or too rich. Check the color of your plugs, black dry and sooty means they are rich, white with blisters lean.

SOURCE: vt1100c2 backfires through pipes on deceleration -

Could be running too lean, check the color of your plugs to know for sure, black and dry is rich white and blistered is lean.,

SOURCE: my 1100 shadow has a pop like a backfire at idle

I would check spark plugs first then if that does not solve the problem. ( GAP AND SPARK) Then lean the carb out. If you recently moved from a lower or higher altitude place then you will need to have the carbs set right for the place that you are going to be riding. The backfiring is an ignition that happens after the combustion in the motor. The gap in the spark plug could be too small or not existent causing this or its the mixture of fuel/air. This would be my first step for solving this problem. After you try this let me know how it runs...