Question about 1997 Yamaha YZF Thunder ace 1000 R

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97 thunderace, electrical problem? feels like its running with less then half its pwr. changed plugs still doing it. thought it was internal till my gauges went haywire. ill cruise at 5K and my revs drop to 0 then shoot up to 11K with no rev changes. Ground problem maybe? coil packs? ECU? SOMEONE HELP ME! :(

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I had the same problem. it was a corded connector that was not advancing the timing. it would idle fine and go off the line but any thing over a bout a 1/4 throttle it "bogged". the plug/connector is located on the left side under the faring by the top of the rad. there are a bunch of connectors there so unplug them all and clean them with WD-40. hope that helps!

Posted on Apr 26, 2013

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The tacho needle movements are telling you that the EXUP valve is not functioning. The valve which is located in the exhaust needs stripping, cleaning and lubricating, then re-setting up. Can be done quickly and cheaply by a Yamaha dealer.

Posted on Apr 25, 2010

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