Question about 2000 Harley Davidson FLHR-FLHRI Road king

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It is a2004 roadking,it is backfiring, running fast and rich.the garage have had it on their machine,but the fault is not showing.

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I assume your bike is fuel injected. Did you take it to a shop that had a dynometer that is equpped with an exhaust gas analyzer? Most of the shops here run the bike up in the RPM range and check the fuel mixture at different RPM ranges. They want to get your bike so that it has a fuel air ratio of between 13.5 and 14.0 throughout the range from idle to about 4500 RPM.

Posted on Jun 01, 2010

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Posted on Jan 02, 2017

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I have the Magnetti efi on my 2001 roadking and when i let off the trottle i have back firing issues is this normal for that yr and model this is my first harley i bought it used 3 yrs ago its always done...


Usually backfiring out the exhaust is caused by air leaks into the exhaust system. When you back off on the throttle, the mixture should be too rich to combust in the exhaust system. If your system is sucking in air and leaning the mixture to a combustable mixture, you get the backfireing. Check the gaskets at the heads, and the connections at every joint in the pipes including the equalizer pipe fitting.

Good luck
Steve

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1 Answer

Sudden drop in fuel mileage from 28 to 20 mpg. Have had it to several garages including 2 Ford dealers with no luck. Runs so rich that your eyes burn while standing beside it and frequently backfires...


from your statement there has been no fault code reading done and it has all been guessing
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