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My 2000 fat boy is back firing real bad when you give it the gas, really loud and blue flames. I pulled the plugs and cleaned them and its worse.I also replaced the gas with 91 octane.

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Check your coil connections it sounds like a coil misfire ignition module or its connector would be my next stop also if your bike still has the cam sensor behind the point cover not sure what year they changed that but if youll pull that cover and its not just an empty hole then your looking at the pickup coil or camsensor call it what you will but its a very likely culprit

Posted on Dec 30, 2009

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Will exhaust from 2003 harley fat boy fit a 1999 harley fat boy


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Back firing


what do you mean stupid? 87 89 90whatever unless you got some serious mods you shouldn't really notice that much difference in the performance between redily available octanes in pump gas. more likely a coincedence. timing; rich fuel mix; jets in carbs among other things can cause back firing. run the tank off or drain into yer mower and put in summpin else if it gets right again blame it on the gas if not the GAS didn't break it somthin else just got screwy good luck bro

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