The bike will cough & backfire (only once in awhile), it gets great gas mileage. I use CHEVRON 91 octane.
There are several things that maybe at fault 1.fuel filter in tank 2.plugs 3.air filter 4.possible air leak have a good mechanic look at the bike and last try a good cleaner like sea-foam due to are gas is drunk with corn alcohol. Fran
SOURCE: My 2006 flstni coughs and backfires. In cold and /
If it's fuel injected, your dealer should be able to remedy that problem, it sounds like it's running a bit lean. He'll have to change the fuel delivery a tad.
Good luck
Steve
SOURCE: Sportster Cough and Backfiring
Hi You might replace the sparkplugs with new ones. Also drain the fuel and put new good gas in. I believe you had a bad batch of gas in.
Hoipe that helps
SOURCE: sportster timing
Time to check the firing timing and tuning of the fuel. you need to flowchart the method of timing the engine to the right timing angle. Also the fuel tuning must be redone which all requires tools and instruments to monitor and correct the settings.
Clean and reset carb, check all port , clean the plugs, adjust the gaps and checck timing settings.
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