Question about 2011 Harley Davidson FXDB Street Bob

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Engine misses Start up fine and runs smoothly at idle speed but starts to miss and stop when you increase the gas.

Posted by Anonymous on

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  • Harley Davidson Master
  • 39,997 Answers

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 valve.
For a prime suspect please visit website below and good luck:
Harley Diagnostic Codes 04 to Present

Posted on Jun 12, 2015

4 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 29 Answers

SOURCE: misses at cruizing speeds when engine gets warm. accels ok

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

roadrunning1
  • 152 Answers

SOURCE: 2002 roadking flhrci starves for gas

Hi there , ok, sounds like your tank is not breathing properly, Check that the petrol cap seal is sealing properly , check your fuel valve and hoses and make sure they are not touching the motor anywhere, most bike operate better with the tank in not in a vacuum so make sure that the breather holes underneath are not blocked , the reason why this phenomena happens is because when the tank is full , the shear weight of the fuel forces it to come out in abundantly which satisfies its request for fuel when you nail it, once the weight is lowered so is the pressure and the fuel has no air to replace itself because the breathers are not sucking in enough air to allow the fuel to flow .

Posted on May 11, 2009

wd4ity
  • 4565 Answers

SOURCE: 2004 1200 xl sportster after engine has been

Sounds like an ignition problem. I don't have a lot experience with the newer bikes as I specialize in the older ones, but it seems to me that Harley went to two coils on the Sportster, one for each cylinder or a "two in one" type coil. I'd check the coil and the spark plug wires. If you can tell which cylinder is cutting out on you, test that coil and the spark plug wire. The primary resistance should be 3-4 ohms across the small terminals of the coil.

Also, if the spark plugs you are running have the screw on ends on them, make sure they are tight.

Good Luck
steve

Posted on Jul 25, 2010

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