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Compression increase from removing centre layer of head gasket?

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Hi what is the increase in the compression from removing the centre layer of the 250r head gasket please?

 

I know on the TRX450r's using a 2 layer (CRF) gasket or removing the centre layer of the 3 layer OEM gasket gives you 0.4:1 bump in compression. Wondering what that equates to on a 250r?

 

Does anyone know the stock combustion chamber volume (CC) also?

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OTMXR I dont know what year the 250R you have is but a 250X uses a two layer head gasket and can be used on the older 250R models.

I dont think I would try separate and remove one layer of a head gasket but Im sure its been done!

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