Backfire threw carb
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2nd Gear
Joined: Apr 2005
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Backfire threw carb
I own a 1990 FXSTC. I just purchased this bike and it is my first Harley. I am having a problem with the bike back firing threw the carb when the bike is trying to maintain speed no matter what gear I'm in. The bike runs great as long as I'm accelerating. The bike is stock and has duel fish tail pipes.
I just went to get it smogged and it failed the Hydrocarbin test with a reading of 2201 ppm if this helps in any way.
Does any one have any ideas. I would greatly appreciate any input that can be offerd.
I just went to get it smogged and it failed the Hydrocarbin test with a reading of 2201 ppm if this helps in any way.
Does any one have any ideas. I would greatly appreciate any input that can be offerd.
Road Master
Joined: Mar 2005
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RE: Backfire threw carb
Hi az. I have a 94 FXSTC which I bought new. It does't backfire through the carb, but it does sometimes seem to starve for fuel. It happens normally just after I start the bike, warm or cold. I havn't had it stall yet, it just seems to miss a beat. It's always done this, so I'm prepared for it when it happens.
I hope you can find your problem.
Cheers
I hope you can find your problem.
Cheers
Banned
Joined: May 2005
Posts: 14,496
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RE: Backfire threw carb
Shimming the main jet needle up with 2-#4 brass washers will cure your problem
This link will give you some insight
http://www.nightrider.com/biketech/hd_cv_mods.htm
This link will give you some insight
http://www.nightrider.com/biketech/hd_cv_mods.htm
Banned
Joined: May 2005
Posts: 14,496
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RE: Backfire threw carb
This graph will give you an idea of when the different circuits are feeding the carb.The second one down is the one that you would richen by shimming it as stated above to eliminate the popping back in the cruise range
[IMG]local://upfiles/2318/3FFB3DA99E88401380C9448A7E7DCC0B.jpg[/IMG]
[IMG]local://upfiles/2318/3FFB3DA99E88401380C9448A7E7DCC0B.jpg[/IMG]
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FullNelson
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