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86 sporster keeps stalling while riding, will start back up, but will stall again shortly, has new fuel filter, new plugs, all vacuum lines good, getting good gas flow, runs super about 5-6 miles then

Keep thinking its either module or ignition pick up coil.

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Have you checked your carbs air fuel mixture screw?

Posted on Nov 26, 2012

  • roger combs Nov 26, 2012

    I just had carb redone and jetted at a Harley repair shop, because I cleaned carb and it was still doing same thing, so I assume they adjusted the air fuel mixture, and it drove fine when I picked it up, I actually rode it few times before it started this stalling out on me

  • roger combs Nov 26, 2012

    The bike does not spit or sputter when it stalls, it just shuts down



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SOURCE: 86 sporty 1200 keels stalling out while riding, will start back but will shortly stall again, I check carb linkage and out new fuel filter, gas is flowing from pet"""", I keep thinking its the module

my guess is the pick up coil. replace it see if that helps they cant be fixed

Posted on Nov 24, 2012

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Bike stalls at idle and under load when hot or cold?

Hi Todd, sure sounds like a fuel problem, since i dont if you have carb or fuel injection lets start with your carb. remove the float bowl and see if there is water in the bottom. if so remove fuel tank drain it completely clean the filter then air blow it dry also mahe sure the line from petcock to carb is not pinched or bent to restrict flow then check your vacuum line to the petcock is attached at both ends and is not cracked max vacuum is necessary to pull the diaphram in the petcock to allow fuel to flow, disasemble petcock and check rubber diaphram for cracks or pinholes. reasemble petcock and check with vacuum gauge to make sure its holding vacuum. put 1 gallon of uncontaminated fuel back in tank and take it for a ride.
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86 sporty 1200. Stalls out while riding, but will start back up, then shortly after stalls again.

Sounds more like you are not getting gas. Check the carb. Check the throttle line that it is adjusted correctly and you can see it moving the lever on the carb.

maybe you gas filter is plugged. Remove the gas line from the carb and open the pet cock. the gas should flow.

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1 Answer

Harley sporster stalls while riding, starts back up but then does it again few minutes later

Hi Roger, and the usual suspects are:
1. Idle speed improperly adjusted.
2. Inlet system air leak.
3. Damaged or restricted fuel tank venting system.
4. Dirty or damaged air cleaner element.
5. Accelerator pump inoperative.
6. Vacuum piston assembly malfunction.
7. Enrichner valve not seated or leaking.
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10. Loose or plugged fuel and air jets or passages.
11. Improper fuel level.
12. Worn or damaged needle or needle jet.
13. Loose or plugged main jets or passages.
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Hi Chris, 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,
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.
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14. Incorrect valve timing.
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Hi Eddisbrow, and the usual suspects are:
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2. Loose, corroded or broken battery cable.
3. Alternator not charging or below normal rates.
4. Failed ignition coil, ignition/electronic module.
5. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor.
6. Faulty ignition switch.
7. Water or dirt in fuel system, carburetor or filter.
8. Fuel tank vent system plugged or gas cap not venting.
9. Fuel tank empty.
10. Fuel valve vacuum line broken or carburator vent line closed off.
11. Restricted, blocked or kinked fuel line.
12. Failed fuel pump, pressure regulator and or fuel injectors.
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