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1993 Fatboy Running Rough

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Old Oct 20th, 2009, 02:18 PM     #1
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1993 Fatboy Running Rough

I will try to explain this the best I can. I was riding the scoot (1993 Fatboy)doing about 65mph, was running fine, then the engine started stumbling as if I was out of fuel, but the tank was full. So I got off the highway, and the bike kept doing the same thing as if I was out of fuel or running on one cylinder, there was also a clunking sound (sounds like a bolt in a tin can)coming from the front cylinder of possibly the carb. I pulled both spark plugs the plugs looked fine. After the bike sat for a while it started fine and ran fine, after about a minute or two running it would act up again. Also when it acts up which is all the time the carb coughs, I noticed oil on the outside of the carb. Could this issue be carb related, or possible ignition coil/module? Any feedback would be appreciated.
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Old Oct 20th, 2009, 03:05 PM     #2
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Re: 1993 Fatboy Running Rough

Difficult to say without testing a few things. It could be a plug wire or bad gas, even an intake leak for the front cylinder.

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Old Oct 20th, 2009, 03:14 PM     #3
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Re: 1993 Fatboy Running Rough

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Originally Posted by Knuckles View Post
After the bike sat for a while it started fine and ran fine, after about a minute or two running it would act up again.
You mean the "bolt in a Tin can" sound would just go away after it sat for a while.? Is the engine completely Stock?
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Old Oct 20th, 2009, 03:19 PM     #4
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Re: 1993 Fatboy Running Rough

The whole issue will go away after the bike sits for a while. But once it warms up a little bit it will start with all the issues. The only upgrade done to the bike seems to be Screaming Eagle Mufflers, all else seems stock. I just purchased the bike two months ago.
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Old Oct 20th, 2009, 03:19 PM     #5
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Re: 1993 Fatboy Running Rough

Look into the intake leak.
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Old Oct 20th, 2009, 03:21 PM     #6
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Re: 1993 Fatboy Running Rough

Thanks for the info, Iam going to look into the intake leak tonight after work.
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Old Oct 20th, 2009, 03:35 PM     #7
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Re: 1993 Fatboy Running Rough

Glider,
You have any ideas where that 'bolt in tin can sound' is coming from. I don't have any idea but it can't be good?

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Old Oct 20th, 2009, 03:38 PM     #8
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Re: 1993 Fatboy Running Rough

That could be almost anything not associated with the problem. Being it's running on one cylinder it could be something that rattles causing the noise.
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Old Oct 20th, 2009, 03:40 PM     #9
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Re: 1993 Fatboy Running Rough

Yep, 10/4, that would do it!


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Old Oct 20th, 2009, 10:30 PM     #10
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Re: 1993 Fatboy Running Rough

Ok.Tried checking for maniflod leak, could not find one. Just out of curiosity I checked the plugs again after running the bike and ow the plugs on both cylinders are black. Could this possibly steer me in the direction of the carb?
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