Question about Yamaha V Star Classic Motorcycles

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I have 2007 yamaha v star 1300awc. got fuel and bike started runnin poorly. wont idle, misses at low speed, but runs great when you get on it. i have drained tank, put fresh gas in with lucas injector cleaner, new plugs, bike runs better but still no idle and poor performance on slow end. thanks

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  • rodzilla44 Aug 02, 2010

    it was helpful and i will try it thanks!

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With all things being equal on just about any vehicle being it car, truck or bike. just about everything is measurable with a tool or by some easy means except fuel injectors. Once everything has been checked out including vacuum leaks,, which is the,most common reason for a fuel injection misfire. Once every avenue has been exausted the only logical conclusion is you have fuel injector that is spitting, or partially clogged so the fuel is not vaporized enough to burn until your at higher revs. Most all fuel injectors have a screen on the inlet side and its possible you just need to clean and blow it out. You could rotate the injectors if possible to see if the misfire follows the injector, that is if you can detemine which cylinder is misfiring. Also fuel injectors can be tested for ohms. They should be about the same give or take 2 ohms max with the connector off it.

Posted on Aug 02, 2010

  • 1 more comment 
  • rodzilla44 Aug 02, 2010

    i did not know they had a screen but was curious that it doent have a fuel filter. could i have picked up some dirt when i refueled? bike has always run great and did before i got fuel. i can ride it but have to keep it idling myself.

  • Susan Price Aug 02, 2010

    never know when you can get bad gas but I doubt this is the reason it did what it did now. Not sure if you have any info on your bike but if you went to bikebandit.com they sell alot of parts and usually have diagrams for all the systems. I would of thought if you have a fuel filter it would of caught and small particles but it doesnt take mush to mess up an injector.

  • Susan Price Aug 02, 2010

    by the way if you have any brake cleaner spray it around any possible vacuum sources including the intake areas on the head and on the injector orings. If the fluid is drawn in the RPM will change indicating a vacuum leak.

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