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27th July 2009
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Biker
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Join Date: Jun 2009
Posts: 5
Reputation: 10
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high speed sputtering
whenever i get on the freeway, as soon as i go 70 or faster, my bike will start sputtering and i will be jerked forwards and backwards everytime it does this.
also, my bike idles just fine, when i drop it into 1st, it shuts off. any tips or ideas for either of these problems? thanks. oh yeah, its an 82, with cycle shack slip ons.
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27th July 2009
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Banned
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Join Date: Sep 2007
Location: Venetian Islands, Miami Beach
Posts: 3,923 Sportster/Buell Model: XLH/I.R.C. Special Sportster/Buell Year: 1974
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"Cycle Shack slip ons" doesn't mean shit. What kind of carb...
...and ignition do you have on it?
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27th July 2009
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Known Troublemaker !
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Join Date: Jul 2006
Location: Lexington, NC
Posts: 7,390 Sportster/Buell Model: Sportster 1200C Sportster/Buell Year: 06
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Need more info, But sounds like its starving for fuel ! Maybe an Air Leak !
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27th July 2009
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Banned
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Join Date: Sep 2007
Location: Venetian Islands, Miami Beach
Posts: 3,923 Sportster/Buell Model: XLH/I.R.C. Special Sportster/Buell Year: 1974
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Or a clogged fuel filter, or a bad petcock. But we'll never...
...know because now he's disappeared after posting the vague question with zero details.
Lord grant me patience...
- SPORTSTER -
Kicking Big Twins in the motherf******g NUTS since 1957
CTFS/QCB
Viva Los Bastardos!!!
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27th July 2009
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Biker
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Join Date: Jun 2008
Posts: 41 Sportster/Buell Model: xlh Sportster/Buell Year: 1975
Reputation: 10
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I have a similar problem with my 75'. Whenever I get up to highway speed and roll the throttle it starts to sputter. Its got the original carb on it and I'm thinking this might be the problem. The damn thing runs rich as hell no matter how you adjust it.
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28th July 2009
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Senior Chief Know It All 2nd Class
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Join Date: Mar 2009
Posts: 1,419 Sportster/Buell Model: XLH Sportster/Buell Year: 1978
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Quote:
Originally Posted by gratefulmelon
I have a similar problem with my 75'. Whenever I get up to highway speed and roll the throttle it starts to sputter. Its got the original carb on it and I'm thinking this might be the problem. The damn thing runs rich as hell no matter how you adjust it.
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As far as I know, it shouldn't be doing that with the stock carb. You should try to mess around with the mixture screws and see if you can't fix that. If it's sputtering when you "roll the throttle" then I doubt it's running too rich. I would think it's the opposite; you're starving the engine of fuel. And if you are convinced that your mixture (idle and under load) is too rich then you should probably look to lack of fuel in the bowl.
Just my $0.02 |
28th July 2009
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Rider Of The Iron Steed
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Join Date: Dec 2003
Location: London, ON Canada
Posts: 24,009 Sportster/Buell Model: XLH Sportster/Buell Year: 1978
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I would, as already suggested, look first at the float level. For the stock carb it should be 16 or 17 mms, exactly, measured pictured in the factory manual. You may find it to be 14 or 15.
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28th July 2009
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Master Mechanic
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Join Date: Jul 2009
Posts: 269 Sportster/Buell Model: XLS1000 Sportster/Buell Year: 1982 Other Motorcycle Model: BSA 650 chopper Other Motorcycle Year: 1970
Reputation: 96
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Gratefulmelon, are you running straight drag pipes ? The inside of my exhaust always looked like the carb was running rich. I went thru that with mine. I ran the bendix carb and messed with it for a long time. Bike ran great, no sputtering, but pipes always looked black and sooty no matter what I did to the carb.
Changed pipes and it seemed to solve the problem.
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28th July 2009
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Biker
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Join Date: Jun 2008
Posts: 41 Sportster/Buell Model: xlh Sportster/Buell Year: 1975
Reputation: 10
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Yeah I'm running straight drag pipes. I've tried adjusting the mixture and also rebuilt the carb...no luck.
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28th July 2009
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Banned
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Join Date: Sep 2007
Location: Venetian Islands, Miami Beach
Posts: 3,923 Sportster/Buell Model: XLH/I.R.C. Special Sportster/Buell Year: 1974
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So what happened to the original poster of the thread?...
...That's really nice --- ask a question and not even show the courtesy of responding when guys try to help you out.
- SPORTSTER -
Kicking Big Twins in the motherf******g NUTS since 1957
CTFS/QCB
Viva Los Bastardos!!!
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