Question about 2002 Yamaha XV 1600 Wild Star

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Not firing on rear cylinder

Have spark and fuel going into cylinder still wont run

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How about compression. Fuel/air, Spark and compression are the only things that run a combustion motor. You have checked the first 2 but need sufficient compression to complete. 130lbs is what you need. And that is actually the lowest. If you have access to a compression tester and it shows low. Try squirting a small amount of 2 stroke oil into spark plug hole then test again. If it raises it is most likely the rings. If not it would be a stuck or bent valve. I wish you luck.

Posted on Feb 05, 2009

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