KX-500 Compression Release Mod! Easy Starting!!!

[Kawadougie]

I found this auction on E-Bay for a compression release for big bore 2 strokes.  I won the auction and have since sent my cylinder off to be modified.  I should have it back by next weekend.  I will give a full report after I ride it.  The whole point is to relieve some compression for starting only.  

http://cgi.ebay.com/ebaymotors/Compression-release-KX500-CR500-LT500-RM500-CR480-Maico_W0QQitemZ4581489332QQcategoryZ10066QQrdZ1QQcmdZViewItem

[quincyman]

Yes I saw that a couple days ago and went back to look at it several times. Can't wait to hear how it turns out.

[Torch654]

Look forward to hearing how this works for you, Good luck.

[Timbowe]

Theres your answer Quincy. Get that compression ratio back and no more busted kickers!

[KXcam22]

My old montesas use to have one but I can't say I have had an issue with the huge KX compression.  Just kick it with attitude (oh yeah and one of the new kickstart levers so it doesn't break off). Cam.

[gowen]

I found this auction on E-Bay for a compression release for big bore 2 strokes.  I won the auction and have since sent my cylinder off to be modified.  I should have it back by next weekend.  I will give a full report after I ride it.  The whole point is to relieve some compression for starting only.  

http://cgi.ebay.com/ebaymotors/Compression-release-KX500-CR500-LT500-RM500-CR480-Maico_W0QQitemZ4581489332QQcategoryZ10066QQrdZ1QQcmdZViewItem

I saw that! I've broken two **NEW** kickstarters. I've since had the head worked to lower the compression slightly and it is better.

I almost did a bid on that, but I was not intrested in a sleeve. But let me know how it works!! It might be a project for a upcoming stock 500.  

[KXcam22]

Gabe,
  Do they break in the same spot? Cam.

[gowen]

Cam, no actually it just takes a chunk out of the aluminum and rotates too far out to give it a kick without your foot slipping off and doing some serious damage.

[Johnniespeed]

My KX starts easy and doesnt break kickers, but I am still interested in how it is installed and how well it works.  I guess we all want a better mousetrap.  Please keep us updated on how well this works short term and long term.

[Kawadougie]

Here you go.  This is amazing.  The compression release works.  The mighty KX500 now starts as easy as a 125.  You pull the lever and it kicks through like nothing and usually starts first kick.  If you look at the photo, it is installed about an inch from the top of the cylinder.  It still has enough compression to fire.  I even put in the thinner head gasket.  Best money I've ever spent.  I was looking at buying a 250 but now I'm completely happy with my 500.  

[Torch654]

Thanks for the update.

[Brett]

I hate to say this but that mod would allow a s**tload of leakage past both rings when piston is rising and surely give far less power.  I thought compression releases for two strokes were in the cyl head so as to give no blow by issues.  4 strokes (oops i said it, ten lashingsfor me) just push down on exhaust valve i believe to release pressure.  I would like to hear how the ring longevity goes as all that blow by will be sure to heat things up well above std.  But its selling point is starting easier and it surely will do that but i believe at a great cost.

[Brett]

Also what is that brown colouring on the back of the two transfer ports?

[doordie]

Epoxi      

//doordie

[gowen]

Wow, call me crazy.. but did they not install a sleeve? Im either blind or I can't see, but it looks like they did not use a sleeve. If not, I'd like to keep up with this one. If I can get the compression down for starting, I could easily save $200 per year in kickstarters. Keep us up to date.

Did you notice any powerloss? Extra heat?

Maybe they installed it in the water jacket to keep the excessive heat down? This is now intresting.