Maintenance & Technical > KX500 Original

1990 kx500 power valve issue

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kawirider1469:
So I picked up a 1990 kx500 for 800 bucks. Not the prettiest bike but runs decent. Decided to put new clutches in today and replace cylinder head gasket. Took power valve off and clutch cover and thoroughly cleaned everything. Clutch oil was like milk and clutch plates pretty much fell apart. Installed new clutches and changed head gasket. Put everything back together and now it acts like it has no power. Hits normal in bottom end and then loses power... it will not clear out and hit. Question is...is there something I could have done wrong reinstalling the power valve? Any advice would be appreciated.

81cr450:
My guess would be the 10mm nut on the actuator arm when you tighten it you can goof up the opperation. You did load the powervalve governor in the cover when you put it on , right?

kawirider1469:
What do u mean by "load up" I've looked everywhere for info on how to do the power valve install and have had no luck

dave916:
sounds like u need water pump seal if the oil is milky [unless it was driven into a deep river :-)  }

I think by load up 81cr480 means did u fit it correctly. [sounds like something is gone wrong in there}
power valve rod has to move out when engine is reved high


if the rod has been moved manualy {by hand} is is possible for the needle of the kipps bearings to fall apart
marked in red

kawirider1469:
I didn't take the head off so all I really took off was the 10mm bolt that holds the actuator arm on. I dis clean inside of clutch cover with brake keen and also put a lil oil on water pump bearing and power valve bearing. I'm assuming all you have to do is push the power valve slide in (towards cylinder) and tighten the bolt. I'm just not seeing any "bad" changes that I could have mmade.

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