Question about 2000 Harley Davidson FLHR-FLHRI Road king
It is carbed and seems to be running lean, popping when downshiftingr
Your Twin Cam plug should be a 6R 12 Harley Plug. Often times the back fire is just the nature of the beast depending on what type of pipes you are running. Harleys do run lean, its an EPA thing thtas why they choke them down from the factory. Since you have a carb you could have an intake leak around the Intake. Also Under the carb is an adjustment screw. Harley plugs it up so people don't play with it. You have to just drill out the plug this will set your air fuel. Whenever I take a carb off I drill out that plug. Heat your bike up operating temp and ear tune that screw. Only other way is with air fuel analizer or a dyno. good luck.also that backfire is caused by fuel hitting your exhaust when you let off just to let you know.
Posted on Jun 15, 2009
Popping/backfiring on decelerating is mostly caused by an exaust leak at the manifold where fresh air is entering the hot exaust and igniting unburnt fuel. Short straight through pipes are prone to this and nothing will cure it. If spark plug colour is light tan or grey (not bone white or blistered) then the mixture is more than likely o/k.
Posted on Feb 27, 2009
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