Question about 1979 Yamaha XS 500

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MY YAMAHA WAVERUNNER 3 RUNS GRATE FOR ABOUT THREE MIN AND THEN ACTA LIKE THE REV LIMITER KICKS IN IVE REPLACED THE COIL AND OVERHAULED CARB ANY HELP WILL BE THANK FULL 1992 650 YAMAHA WAVERUNNER 3

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330jetjoc

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Yam 650 LX turns over no spark from plugs. Tried new ones still same. Any thoughts?

Posted on Jul 02, 2011

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Anonymous

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Had the same problem. Trash in the gas tank. Also check the heat sensor. That is what limits the revs. Had a bad one myself.

Posted on Aug 20, 2009

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You should check your feul filter or maybe the feul tank it could be you have trash in your tank and it takes a few minutes to pick up the trash and restrict feul flow possibly not clogging the filter all the way allowing just enough feul for it to idle

Posted on Jul 08, 2009

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Sputtering at 5000 rpm


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Have you adjusted or checked the Valve clearance lately along with the Timing chain tensioner to be sure all are within adjustment specs?
The example you gave where it does it in 2nd gear, 3rd gear, I am sure it would do it in any gear as it sounds exactly as if teh engine is running up against a rev limiter or mechanical limits of teh valve train.

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