Maintenance & Technical > KX500 Original

KX500 compression release valve photos

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quincyman:
OK guys, I know I started this thread a long time ago. The reason I didn't report how well this valve works is that I purchased a 2000 model carb to replace my aging 1994 carb. I didn't want to put the bike back together and run it on the old carb.

Anyway the guy on eBay took my money and never shipped the carb. Eventually I had to file a complaint with eBay. They took the guy off eBay and finally reimbursed my credit card. I would have rather had the carb. The only thing really wrong with my 94 carb is the slide is starting to loose it's finish.

Two day's ago I put the bike back to together with my old carb. It has been sitting for about 5 months. Turned the fuel on pulled my decompression valve and kicked it about 4 times and it started up. After I got the idle dialed in I took it for a spin and with the newly finished cylinder and piston the bike has more torque than ever. When I rev the bike while standing next to it the back end actually lifts up a bit then settles down.

Back to the decompression valve. Yes it kicks over just a bit harder than my KDX220. So I would say it kicks over like a 125. It also starts up quicker. It seems that with the compression valve pulled and giving it a full kick it spins the crank faster and therefore starts quicker and easier. I love it.

Next comes the Revloc auto-clutch. The only issue I had with an autoclutch before was you can't compression start the bike. Now that the bike kicks over so easy, I'm not worried about compression starts. :mrgreen:

quincyman:
I have now taken the K5 w/decompression valve on two single track forest rides. One for 40 miles and another for 55 miles. It was nice at the end of a day of stopping and starting the bike that my knee was not feeling the pain/soreness it normally would have. I should have got this decompression mod 8 years ago when I first heard about it.

1980mcneil:
Man this is an old thread but maybe you are still around.  What was the power loss like because of the mod? I assume you lost some psi?...

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