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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 5th July 2013
mamelukesword mamelukesword is offline
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Default Carb help

All,

2005 HD 883 Custom. Bike came from Guam in rough shape, though it ran good there. Sat for 2 years. I did the normal drain the tank, completely cleaned carb and jets.

Bike Starts and Idles great. Once warmed up and enricher is pushed all the way in it bogs down with throttle. If you hit it quick it does fine. smooth application of throttle creates the stumble (bog down) condition. I replaced the diaphragm and slide still nothing. It will run with about 1/4 enricher pulled out.

When looking at the carb there are two small vacuum holes on the air filter side (I have a pic, cant get it to load). If I plug the left hole the bike dies, but if I plug the left hole while operating the throttle the bike works great. Anyone now what would cause these symptoms?

Thanks in advance
Dennis
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  #2  
Old 5th July 2013
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Don Burton Don Burton is offline
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Originally Posted by mamelukesword View Post
Bike Starts and Idles great. Once warmed up and enricher is pushed all the way in it bogs down with throttle. If you hit it quick it does fine. smooth application of throttle creates the stumble (bog down) condition.

Thanks in advance
Dennis


Does it only do this when hot? If so check the diagnostics in your speedometer for a trouble code for a bad crank position sensor.
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Old 5th July 2013
mamelukesword mamelukesword is offline
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No it does it at start up. I have three sportsters so I know they are sensitive at start, I am about to throw in the towel and take it in. I prefer to do my own work. I will check the codes just in case, with the crank position sensor cause problems when cold?. Thanks
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Old 5th July 2013
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I've never heard of the crank position sensor causing problems when cold, however I have heard of one not showing a trouble code when it was bad.
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Old 5th July 2013
mamelukesword mamelukesword is offline
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Checked the codes....none. How would I test the sensor if its not throwing a code?
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  #6  
Old 5th July 2013
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Originally Posted by mamelukesword View Post
Checked the codes....none. How would I test the sensor if its not throwing a code?
It's likely that your carb is the problem then. Replacing the sensor is the only way that I know how to test it. They cost about $50.00 at H-D dealers. I've never seen nor heard of one acting up when cold but it might be possible to have an atypical one.
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Old 6th July 2013
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Quote:
Originally Posted by mamelukesword View Post
All,

2005 HD 883 Custom. Bike came from Guam in rough shape, though it ran good there. Sat for 2 years. I did the normal drain the tank, completely cleaned carb and jets.

Bike Starts and Idles great. Once warmed up and enricher is pushed all the way in it bogs down with throttle. If you hit it quick it does fine. smooth application of throttle creates the stumble (bog down) condition. I replaced the diaphragm and slide still nothing. It will run with about 1/4 enricher pulled out.

When looking at the carb there are two small vacuum holes on the air filter side (I have a pic, cant get it to load). If I plug the left hole the bike dies, but if I plug the left hole while operating the throttle the bike works great. Anyone now what would cause these symptoms?

Thanks in advance
Dennis
Those two holes sound like the air bleeds. The one on the left feeds the pilot jet cavity. The one on the right (center of the carb) feeds the main emulsion tube. By blocking the one on left you are cutting off the air that is mixed into the pilot circuit, so you are in effect making it richer. This is saying that the pilot circuit may be lean (DIRTY). Did you pull the pilot jet out and clean it thoroughly including all the little holes in the side of the stem that sticks out of it? That is a mini emulsion tube and if the holes are plugged it will starve it for air (the opposite of what it appears to be), and if the jet itself is partially plugged it will improve with less air like you just did, but I would start there, and make sure every small hole in the carb body is totally clean and passes air. (I spray carb cleaner through every one of them to double check and make sure it comes out the other end good).
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Old 6th July 2013
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Bike Starts and Idles great. Once warmed up and enricher is pushed all the way in it bogs down with throttle. If you hit it quick it does fine. smooth application of throttle creates the stumble (bog down) condition. I replaced the diaphragm and slide still nothing. It will run with about 1/4 enricher pulled out.
This should indicate too XXXX, CORRECTION : I SHOULD HAVE SAID RICH, at idle. It's possible to have a clogged idle jet, but leaky enrichener to keep it running at idle. Check float level, slide height at idle,and make sure you get a response to the idle mixture screw. If you do, set it to 2 1/2 turns out and leave it there until you find and fix the problem, If the idle does not respond to moving the idle mixture screw, you have to find and fix that problem. Maybe intake manifold seals are leaking.

I'm not sure about the vacum hoses. Check a parts book diagram.
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Last edited by XLXR; 7th July 2013 at 18:20..
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Old 6th July 2013
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Thanks for the inputs. I have had the carb apart 4 times to clean. I will clean it again this weekend, paying special attention to the pilot jet. Float level and Slide level are good. Carb responds to inputs in the screw, so I set it at 2 1/2. I am also going to replace the seal between the carb and Intake. Right now everything is just a best guess. Bike runs normal with just a little 1/4 inch enricher pulled out. What are the symptons of a leaky enricher?

Dennis
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Old 6th July 2013
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The hole at 10 oclock in the face of the carb is the "Bowl Vent" and must not be blocked.

Is the needle jet in correct ? Long side up ?
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