Question about Harley Davidson FLHTCUI Electra Glide Ultra Classic Motorcycles

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2007 flhtc won't idle

I just put gas in it now it won't idle. i added some ocatane boost and ran it on the freeway but it didn't help. now it back fires bad. it was running fine until i put the gas in. do you think it could be bad gas? if so what should i do?

Posted by Anonymous on

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  • Harley Davidson Master
  • 40,841 Answers

Hi Anonymous, try a fuel stabilizer. Good luck.

Posted on May 26, 2015

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  • 2 Answers

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Posted on Jan 02, 2017

  • 6966 Answers

SOURCE: xv750 virago 1990, idles on only 1 cyln then cuts out

Hi and welcome to FixYa,

Let's try process of elimination:

  • remove both pugs;
  • reconnect each plug to respective sparkplug wire;
  • ensure that the threaded metal part of the plugs touches bare metal of the engine;
  • crank/start the bike;
  • the plugs should show spark at each electrode alternately;
  • if yes, the plugs, coil, ignition system works;
  • if not, the plug not with sparks has an issue which could be the plug itself, the sparkplug wire, the ignition coil, the CDI/igniter.
Having done this and both plugs have sparks, then it is fuel issue. To verify, you could try:
  • at the bottom of each carb is the bowl with a drain screw;
  • if the each carb has fuel, loosening each of the drain screw would allow fuel from the bowl to drain through the drain hose;
  • which ever carb/bowl has no fuel draining would be suspect;
  • of course it could also be a blocked fuel line (kinked) or weak fuel pump;
  • if both bowls/carbs drains fuel, then it would be fuel delivery to the combustion chamber;
  • this then would require cleaning/rebuilt.
Good luck and Thank you for using FixYa.

Pls be informed that due to my current rank and rating, even a Helpful would be detrimental to my status. Should this solution not address your concern, it would be appreciated if you could just not rate it at all. Cheers.

Posted on Dec 28, 2008

  • 3 Answers

SOURCE: won't crank set up about 8 months

Start with the basics, (****, Squeeze, Bang, Blow).
Check fuel is getting to cylinder.
Check Spark plugs by holding on cylinder head and cranking see if sparks.
check compression, should be approx same across all cylinders usually about 120-140 psi at a guess. I have had an older engine still running fine with 100 psi. (Workshop manula tells exact limits)
Check exhaust is clear some idiot could have blocked it for a laugh!
check air filter is fairly clean. Oil type can be cleaned paper type are disposable. I would initial just hoover it if its a paper one.
If you have a spark and fuel and compression and it still plays up check the ht leads are in good condition, even dirty plugs can arc to earth loosing the vital spark needed. Older coils do tend to break down particularly yamaha ones! I do not know where triumph source there parts but i know it is from various countries.
Hope this helps a bit


Posted on Jan 24, 2009

  • 5 Answers

SOURCE: bike will not idle witout having choke on a bit

I have a supermagna and used fuel stablizer once and it wasnt fit it gummed my carbs up,ive cleaned mine often and it isnt rocket science,remove the tank airbox assembly,loosen up the boot flanges that hook the carbs to the motor(ones on carb)then remove the carbs,then the cables,choke and throttle,do not remove carbs from assembly(leave all 4 together)remove the bottoms and tops of a carb,removefloat and jet,then remove all the brass jets and clean them so you can see through holes,,blow out all the holes in carbs,and reasemble,works for me every time,about two hours to do,good luck

Posted on Apr 05, 2009

  • 4 Answers

SOURCE: engine stalls after running for 25 miles?

One more thing to try...loosen the gas cap when it starts misbehaving. If the tank is losing its vent, then it can act that way.

Posted on Jul 22, 2009

SOURCE: On my Yamaha Maxim 700x,the plugs are running black.

Your bike's engine needs a good tune up.
Please follow this site for tune up procedure of your bike's engine :-

Posted on Sep 08, 2009

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