Question about 1993 Harley Davidson FXR Super Glide

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Runs poorly out on the road.

1984 1340cc shovel head runs rough and back fires while on the road.

Posted by Anonymous on


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Hi Anonymous, there is a whole laundry list of could be's, to start shovels were infamous for getting extremely poor top end longivity, 15,000 miles was average before a top end overhaul was necessary. That being said I would start with ignition spark plugs should be clean and dry the electrode should have a tan color and the Harley Davidson plug number is 5R6A gapped at .040" plug cables should be carbon fibre core and radio resistant. Coil should have no cracks and a primary resistance of 2.5 to 3.1 ohms the secondary resistance should be 10,000 to 12,000 ohms. Battery should be charged 12.5 volts or better and connections should be clean and tight negative cable should have a clean conection to the frame. Alternator should put out 13.8 to 14.7 volts DC to the battery. Check for bad intake seals they will have a wet or damp residue at the intake ports and bad exhaust gaskets that will have powder burn like residue at the exhaust port. Check the carb for proper float level and make sure jets and air passages are not blocked or clogged and check for water in the bowl, clean as necessary. Ckeck to make sure the accelerator pump is working and the choke plate is completely horizontal. Check the fuel tank and filter for contamination and repair as necessary. Those are the main actors in the laundry list show. Good luck

Posted on Apr 20, 2015


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Posted on Jan 02, 2017

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SOURCE: Stalling and backfireing

to me it sounds like it might need some spark plugs put in

Posted on May 29, 2009

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