Maintenance & Technical > KX500 Original
crank stuffer
BDI:
--- Quote from: kaw rider on December 28, 2007, 06:51:46 PM ---i have some ratio number for big single 2 smoke motor. do anybody have the ccr numbers.
--- End quote ---
I think you are just going to have to cc the bottom end yourself. Do you really want to depend on what someone else says?. :|
kaw rider:
i'm not to the stage of the dyno testing yet. working on different things now. but i will when i get there. i did find one error in cylinder. it short cycle the ports.
BDI:
--- Quote from: kaw rider on December 29, 2007, 03:26:26 PM ---i'm not to the stage of the dyno testing yet. working on different things now. but i will when i get there. i did find one error in cylinder. it short cycle the ports.
--- End quote ---
If your talking about the fact that the piston does not go down far enough to uncover the transfer ports Your right on the money. This is good for a few horse power when corrected and there is a couple of ways to do it and there is some numbers to correct it by but I'm not sure if I want to go blurting them out.
kaw rider:
that's not the one that i found. what would happen if the piston shirt didn't cover the exhaust port at tdc.
BDI:
If your piston skirt does not cover the exhaust port at tdc then someone has lowered the floor of your exhaust port to meet the top of the piston at bdc. This would normally be a performance mod on a two stroke motor. On the KX500 the piston skirt is not long enough to cover the port at tdc. This is bad. It's going to allow the return wave from the pipe to shove exhaust underneath the piston and foul the intake charge with exhaust gasses. I have thought about contacting Wiseco about having pistons made with a longer skirt but it would be more work than it would be worth unless I was going to have a bunch of pistons made.
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