LT500R power valve - ATV Enthusiast Community

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Old 03-12-2002, 08:58 PM
Thread Starter
Join Date: Sep 2000
Posts: 42

I have a 1987 LT 500r and was wondering how much the power valve should rotate on its axis? 5°,45°, 90°? I know that at 4500rpm the power-valve should rotate seen though the sight glass on the jug. I have seen virtually no movement. The quad is not sluggish just a little raspy at the top end. This leads me to believe that the power valve has little effect on performance. It doesn’t make sense to me. I would think it would run like crap. Any comments are appreciated. Thanks
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Old 03-13-2002, 12:18 PM
Pro Rider
Join Date: Feb 2002
Posts: 1,294

4X, The mechanism will rotate approx 90 Degrees when it does actuate... I don't remember the actual RPM, but I know it's up there (about 5,500 RPM I think).
There is an extensive explaination of the different power valve configurations here:

The LT500 uses the SAEC setup. You may be in need of adjustment if yours isn't working.
They do have a tendancy to gum up if you're not using a really good quality oil.
This may require disassembly and a good cleaning to make it work the way it should.

Hope this helps.
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Old 03-13-2002, 08:00 PM
Pro Rider
Join Date: Sep 2001
Posts: 292

I've had to replace the power valve governor assembly on my 87 zilla. The shaft had broken and the ***** were scatered. Also had to replace the thin spring on the other side of the jug.

87 Zilla
87 QuadSport
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