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
  • 47,792 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

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Posted on Jan 02, 2017

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  • 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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Might have to reset the codes on the computer. Take the + battery cable off the battery and reconnect it afer 5 minutes. Next try to start the engine without holding the gas petal down, it should start and run rought till the computer resets itself. If engine stops, restart the engine and hold the gas petal down and give it enought gas so it will run smooth, it may take 5 minutes or so for it to smooth out and run at idle speed. If this did not fix the problem, check for a vaccum hose that may be off some where on the engine

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My truck starts and stalls and will not idle


Try increasing the idle speed. If you don't know, this is how to do it.
Open the bonnet and ask someone to push and release the gas pedal a five second intervals.
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Turn the screw "clockwise" to increase the idle speed. Only turn it about 1/8 of a turn at a time (as needed) until the engine runs smoothly.

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My 350 will not stay running. It die when i hit the trigger. I changed all filterss and plugs. If I take off the air filter and use my thumb to open and close the air flow over the carb it will work.


Assuming the carb isn't contaminated with debris I would check / reset the carb settings.
Lightly seat the low and high speed screws and back them out 1 1/4 turns. Try so start saw...if it starts and will idle then let the saw warm up. If it won't start then Back the low speed screw out 1/4 turn...try again. Once the saw is warm then set the idle screw so the chain just stops rotating. Adjust the low speed screw inwards and listen for the rpm to increase as you do...keep going until it starts to drop in rpm....back the screw out until rpms have peaked and back the screw a bit more past that...less than 1/4 turn. Try to work the throttle and tweak the low speed screw until the saw revs crisply...readjust idle speed. Apply full throttle and turn the high speed screw in until you hear the saw "sing"....it will get very smooth and the rpms will increase. DO NOT leave the screw at this setting as it is running very lean and will burn up in short order. Back the screw out until you hear the saw tone "roughen"...the revs will drop a bit and the smoothness in the exhaust tone will disappear. Back the screw out a bit more past the point where the saw tone start to roughen....this will make sure there is sufficient fuel when the saw starts to actually cut.
If none of this works for your saw I would suspect the carb needs to be cleaned / kitted. Also doublecheck that there are no air leaks between the carb and cylinder. Air leaks could be caused by bad gaskets and or loose mounting fasteners.

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I have a 1994 Honda Accord 4 door v6. I have rough idle when in drive and smooth idle when in neutral. Also rough take offs from a stop or slow speeds. If I pump the gas pedal a few time the rough take...


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  • an engine miss will appear to diminish at higher rpm due to centrifical force.
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2 Answers

Chain saw will idle, but not run at full throtle


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Afterwards you may find it doesn't run at low throttle well. If not, try the same thing starting to turn left until it smooths out. If it doesn't, screw to the right. Again, the idea is to go until it sounds rough, then back off a half turn.

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