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Author Topic: 250 cylinderhead squish  (Read 2070 times)

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Offline SOHC

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250 cylinderhead squish
« on: December 10, 2015, 08:36:19 AM »
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?
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Offline LukeG

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Re: 250 cylinderhead squish
« Reply #1 on: December 10, 2015, 10:13:39 AM »
I was told by to aim for 0.75-1mm squish. You may need another base gasket.
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1990 KX250 - Wanna be road racer!
2007 DRZ 462 Motard

Offline SOHC

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Re: 250 cylinderhead squish
« Reply #2 on: December 10, 2015, 05:51:52 PM »
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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