Maintenance & Technical > KX500 Original

compression ratio

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GreenMachine:
Can some one help me with figuring out my c.r. I milled about .008 off the head then lapped it flat. Also lapped my jug flat also. I have 45cc's in my head. standard square bore 500 (86mm x 86mm) This is where I am getting trumped. I am running a wiseco pro light and the center of the piston is above the deck by .030 of an inch. The outer portion of the piston is .010 below the deck. and head gasket is .015 thick. I can figure it with a flat top piston, or even a dished piston, but I don't know how to figure it up with the piston above the deck.

Thanks for any help,
Jody

CR480R:
put a lil grease on the rings and fill the fill the combustion chamber through the spark plug hole....with the piston a tdc of course...

BDI:
I come up with 11.3:1  I added your deck hight to the gasket thickness and figured the piston dome at one cc. Using some oil to cc your trapped volume Is a good way to do it like cr480r suggested but rember to add the spark plug cc. I can't remember how many cc's a plug holds but I do remember it's enough that you need to figure it in.

kaw rider:
1.8cc. depends on what plug you have.

Brett:
When working out your compression ratio with a two stroke you should take into account the effective compression ratio which is only using the stroke from when the transfer and exhaust ports have been closed off

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