Maintenance & Technical > KX500 Original
KX-500 Compression Release Mod! Easy Starting!!!
KXcam22:
Kawadougie,
I can't see a liner either. Can we have a pic from the top looking down the two coolant holes over the release. Cam.
Kawadougie:
The aluminum sleeve is what you see in the photo. The valve is back a bit from the cylinder and out of view. The brown coloration in the ports is probably from epoxy when Eric Gorr did his magic. :D I did not notice any change in power at all or extra heat. It was installed about 1" from TDC because you need to have SOME compression in order to start the motor.
Many years ago, the compression releases were installed directly in the head only to provide compression braking but you could not start the motor because there was no compression. I installed the thin head gasket and even ran 50/50 race/pump gas to test the unit. I don't believe it will add to ring wear any more than any other port in the cylinder. :lol: I'll put some more photos in the gallery.
Brett:
I say it will wear the ring more not because it is going over the hole but because of the leaking hot air blowing past on its down stroke. If you have ever seen a ring stuck apart from being a bitch to start they soon seize due to all the blow by creating overheated ring and piston. Yeah i imagine the decompression valves in the head give awesome braking as i had the unfortunate experiance of a sparkplug unwinding (yes slack pit crew work) and popping out at the end of a straight in my racing gokart and it was as if it seized, it basically locked up and spun me into the woodchips. Luckily the sparkplug didn't land in my lap and give me 16,000rpm's worth of zaps from a cdi ignition in the nether regions. Also for your sake i hope the bore lining doesn't flake aroun where they bored the hole through.
Kawadougie:
Apparently this guy has been doing this modification for years. I'll let you know if I have any problems. Meanwhile, I think I'll install a kickstarter from a KX-125. :wink:
quincyman:
--- Quote from: Kawadougie ---Apparently this guy has been doing this modification for years. I'll let you know if I have any problems. Meanwhile, I think I'll install a kickstarter from a KX-125. :wink:
--- End quote ---
If I understand this mod correctly the blowby only happens when you activate the valve to start the bike. Is that not correct?
Also the sleeve the article is talking about is not a cylinder sleeve but the sleeve the valve fits into and that is what you see in the picture. Is that not correct?
I'll tell ya, you pretty much have me sold on this one.
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