Maintenance & Technical > KX500 Original

How do you set the Powervalve lever?

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Pinchy:
Whats the proper way to set the powervalve arm that comes out the crankcase and slides the rack for the valves?

I just set mine so that if your facing the front of the engine look back towards the tail end its rotated fully clockwise so its pushing the arm all the way in.

Could it overshoot center like this or do I need to check the position of the valves by looking in the exhaust when you tighten the nut down?

Rick:
Hmmm.  I'm not aware that there is more than one way to set the arm.  Can you take a picture so we can see?

Pinchy:
Ok heres a Picture.
On mine the shaft isnt keyed so you could set the thing anywhere.

Sharc:
I'm pretty sure you want the sliding shaft slid all the way out. Thats how I did my 2002 K5.

Rick:
When the motor is off, the power valve activation shaft in the base of the cylinder should be all the way pushed in.  As the motor revs and RPM increases, the arm pulls the shaft outward and opens the power valves.  While I have never removed the arm from the clutch side cover, logic says you need to set the arm so the nipple slides into the activation shaft washer (for lack of a better term) without pulling the shaft outward at all.  This will ensure that at idle, you have proper seating of the power valve.
 
In reading your original post, I think you have the right idea.

Let us know how she runs.

Rick

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