Question about 2003 Harley Davidson FLSTS Heritage Springer

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Misses at cruizing speeds when engine gets warm. accels ok

2002 HD soft tail Herritage Classic. At start up engine stalled frequently and has a cough or miss at cruizing speeds. appears like ignition may be cutting out. Had to run with enricher at 1/2 position even when engine was warm. Adjusted idle speed. Idle ok and can run with enricher in when warm, but still has cough at cruizing speed. Accelleration is fine.

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  • Anonymous Mar 25, 2014

    it starts fine runs greatfor a few miles then it starts missing


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Sounds like drumbanger is on the right track. If this bike ran ok in the past and you have not made exhaust or intake changes, the low speed jet may be partially plugged or you have developed an intake air leak. If this problem has always been there or you have changed something, consider going up a size or 2 on the low speed jet.

Posted on Dec 25, 2008

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This sounds like your fuel jets need cleaned! also check ari fuel mix!

Posted on Dec 12, 2008

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Not uncommon for a HD to occasionally pop back thru the carb. If intermittent I would not worry about it. If frequent, you probably pinched the diaghragm when you installed it and poked a hole in the rubber. If it's OK, try gettin a kit for the carb that has new jets, slide spring and drills. Thunderslide or Yost power tube works well. If not available in your area, re-jet the slow speed jet to a 45 or 48. Leave the main alone. Enlarge the hole in the slide to 1/8". NOT the hole for the needle!! It's right beside it. Remove the carb for the next modifications...Remove the plug in the idle screw well. (Located under the carb close to the intake manifold. A tall skinny tube running off the carb body.) Drill a hole in the plug and use a screw and pliers to remove it. Re-install carb. Turn the idle mix screw (with a skinny screwdriver) until you get a good idle with the engine hot. Re-adjust idle speed to about 1000 rpm.

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