Author Topic: POWER VALVE OVERCLOSING (Read 7502 times)

01KX5WOODSRIDER · « **on:** October 16, 2005, 11:34:19 AM »

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 · « **Reply #1 on:** October 16, 2005, 11:54:21 AM »

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 · « **Reply #2 on:** October 17, 2005, 01:39:16 AM »

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 · « **Reply #3 on:** October 17, 2005, 04:28:59 AM »

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 · « **Reply #4 on:** October 17, 2005, 04:36:32 AM »

My account numbers is ........

//doordie

01KX5WOODSRIDER · « **Reply #5 on:** October 17, 2005, 07:30:51 AM »

Cam is right about the bearings. Mine came from the bike shop. I have a lot of different sizes all that fit bicycle components.

Doordie I owe ya.. Thanks for the tuning tip!

KXcam22 · « **Reply #6 on:** October 18, 2005, 02:08:43 AM »

Doordie,
Anyway to email beer.....??

doordie · « **Reply #7 on:** October 18, 2005, 10:37:44 AM »

01KX5WOODSRIDER,
Np, glad to help!

KXcam22,
My DVD-drive is open with a glass on,just waiting!

Anyway, just preparing myself and bike for R?nnesl?ttsloppet this saturday and after 2 weeks,new race at Gotland grand national.

Wish me luck (you know me, do OR die)

//doordie

KXcam22 · « **Reply #8 on:** October 18, 2005, 02:57:40 PM »

Doordie,
Gotland, thats the huge one isn't it? 800-900 riders? I'm trying to score a work trip this winter to your vicinity. Pay up that beer in person! Cam.

doordie · « **Reply #9 on:** October 29, 2005, 02:54:09 AM »

KXcam22,

Win that work trip and we will meet ,my door is always open for a KX500 owner!

Yeah, Gotland Grand National coming up next weekend!

//doordie

afritts4u · « **Reply #10 on:** October 29, 2005, 03:43:25 AM »

I also recently did a complete rebuild of my top end. I too found that my power valve was over closing by about 5mm. I read all the tips and tricks about fixing this. In my scenario I was simply able to line up the Rod thing one gear spline over from the dots. This made everything line up perfect. Put everything back together and it started first kick (that never happened before) it still starts first kick and runs like a champ!

doordie · « **Reply #11 on:** October 30, 2005, 04:59:55 AM »

afritts4u,

The Kawasaki-japs is good thinkers,but they "over do-it" this time with KIPS.

The same with the ignition which fire 2 times each revolutions.

//doordie