Maintenance & Technical > KX500 Original

POWER VALVE OVERCLOSING

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01KX5WOODSRIDER:
Today I finally decided to take off pipe and look at the power valve.
I hadn't really understood the big deal about over closing power valves
till now. Mine were overclosing which I now see that means they weren't
closed when they should have been. I ended up using a .125 inch ball
bearing under the stop bolt on left side of cylinder. Total time to remove
pipe and covers to get to power valve rod and replace was only 30 mins.
My bike has never sounded right when idling and always felt kinda
sluggish up to 1/4 throttle. I've only ridden it on street a little so far but it
now idles with a sharp "pop pop pop" now and it jumps with acceleration
as soon as you touch the throttle now. I'm excited about my next trail
ride.

hughes:
Is the ball bearing just trapped between the side cover screw and the rack and pinion rod :?: Is the ball bearing just loose and allowed to move around in between the rod and cover screw :?:

01KX5WOODSRIDER:
Yes. Its just loose behind the bolt on left side of cylinder. Its too big to jam anything. I had the cover off the right side of cylinder when I was checking the valve and pulling it through its stroke and it works just as smooth as before.

KXcam22:
The ball bearing is an easy and pretty typical way of shimming it. It is contained and so can't get lodged anywhere it shouldn't be. I though I was smart and tried making a custom bolt but it was a lot of work and didn't work in the end.  The balls are available at a bicycle store in unlimited diameters. Cam.

doordie:
My account numbers is ........ :lol:  :lol:  8)  8)

//doordie

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