Question about 1998 Yamaha V Star Classic

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Xv750 virago 1990, idles on only 1 cyln then cuts out

It used to run on one cylnder then the othoer woud fire and it would run fine, now it barely rus the abruptly shuts off after about 2 minutes, the second cylnder doesnt seem to fire at all. CDI box? coil packs? I dont think it is fuel I rebuilt the carbs 2 years ago and it ran fine after i rebuilt them. spark plugs are fine.

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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

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