Maintenance & Technical > KX250 / KX125

250 cylinderhead squish

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SOHC:
I have a 1990 kx250 that i have just rebuilt the engine, i checked the piston to head squish and it has only 0.43mm including the gasket, i had the cylinder bore re plated and they refaced the cylinder deck so that must have decreased the clearance a bit, also the head has been planed at some stage in its life.

What should the clearance be?
are they any good mods to do when I take it to be re mechained?

LukeG:
I was told by to aim for 0.75-1mm squish. You may need another base gasket.

SOHC:
Cool thank you, I am going to try another head as I think mine has had the holey s**t planed out of it.


I can't seem to find the info for a 1990, they say if you get the squish right they go very well

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