Maintenance & Technical > KX500 Original
KX-500 Compression Release Mod! Easy Starting!!!
Brett:
No the blow by is caused by the rings being over the decompression port which then leaves a gap for the compressed air to blow past. This is its (possibly only) major flaw. I'm sure kawadougie will let us know how it goes. You could potentially keep an eye on it by looking up exhaust port to see if any coating has flaked off and also through inlet port to see if any piston and ring scuffing.
Kawadougie:
The release valve sleeve is installed by boring a hole through the water jacket into the cylinder. I understand what Brett is talking about but I didn't notice any change in compression or power. I installed this with my two year old old piston and rings to try it out. I've got a new Wiseco piston kit coming and I'll probably ride it a few more times before I install it. The only negative thing is that the decompressor valve blows some spooge over the back of the motor. I think I'll run a vent tube elsewhere.
quincyman:
--- Quote from: Brett ---No the blow by is caused by the rings being over the decompression port which then leaves a gap for the compressed air to blow past. This is its (possibly only) major flaw. I'm sure kawadougie will let us know how it goes. You could potentially keep an eye on it by looking up exhaust port to see if any coating has flaked off and also through inlet port to see if any piston and ring scuffing.
--- End quote ---
My cylinder is steel sleeved so I would not have to worry about flaking. I will probably do this after I have new steel sleeve installed in mine since it is on it's last bore job. I already contacted the company and asked about boring out a cylinder with this mod on it. They said there would be no problem.
hughes:
The blow by should not be a problem because it's on the intake side(cooler temps.)In coming air is chasing burnt gas from this side to the other. Blow by on the exhuast port side know thats a problem.
Brett:
If only we could see a dyno graph of a before and after. ANY blowby will cause reduced power.
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