Question about Harley Davidson XL Sportster 883 Motorcycles
When starting my Harley 1991 sportster it is spitting out gas from the carb will not tsay running and black smoke is comming out of the exhaust. I changed the fuel thinking that was the issue(BAD GAS)but no luck. I also took apart the carb and cleaned it. I didnt find and issue there. Thank you for your help in advance
Posted by Anonymous on
Hi Anonymous, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals especially the ground cable at BOTH ends, ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e
Posted on Jun 09, 2015
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Posted on Jan 02, 2017
have you changed the fuel filter? you are not getting enough gas, are jets squeaky clean? there is a good fuel system cleaner in the USA called Berrymans B12. put some in the tank warm up bike then let it stand overnight and see what happens. if still no luck repeat process. if you still have same problem then get new fuel filter
Posted on Apr 02, 2009
foat problems buddy adjust float in the manual it is set to high so it is shutting fuel off take carb off take bowl off and adjust the metalk the little valve is hanging on
Posted on Aug 09, 2009
I have the same bike, but never ran sea foam in it but ill tell ya when i put sea foam in my mustang it blew black smoke for a good while, but i thinks its normal for it to do that, i would run it for a while to get all that sea foam out of there, as far as the idle being rough what do you mean, cause mine idles funny too, but i was told its normal for it to be idleing like that. Man i hope i help you out some. You wouldnt know the size of the fuel line is would ya??
Posted on Aug 20, 2009
SOURCE: carb trouble on harley Sportster
Not saying this will be your solution, but certainly worth considering. We had some Onan generators that sat too long at out RV dealership and were basically told carb would need replacing, as they do not have rebuild kits. At $500 a shot we decided to dump some Lucas fuel treatment and fresh gas in it. We basically tripled recommended dosage on bottle, and when engine ran we had enough lucas in there that it smoked like crazy but ran. We would run a little more through it, shut it down, let it sit for a few hours, start again, run a little, shut it down. Then let all that cleaner sit in overnight, and filled it with fresh gas again, and started it up, and after an hour or so of running steady, quit smokin, and ran like a charm. $10 worth of Lucas vs $500 carb. Did same to 3 other generators with same problem, and 2 out of 3 were cured. As it says on their site, too much will not damage the engine, so we didn't worry about that. After they were running good again, we replaced spark plugs and they were good to go, and owners were thrilled. Maybe we got lucky, but for $10-$15, I'd try it.
Posted on Apr 18, 2010
The float is stuck open in the leaking carb. Remove the float bowl and clean the carb after removing the pin holding the float in place. While the float is out, shake it to see if gas has gotten inside it. If so, you will need a new float or will need to drain the float then re-solder it to seal it up again. To drain the float chances are you will need to drill a vent hole in it to allow the gas to drain. Just solder the vent closed when done.
Posted on Jul 14, 2010
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