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Hi all.

Just wondering, if I had been riding an enduro bike with a large area 2.6mm squish and machine it down to 1.2mm, how would this affect my jetting, and why? No other changes have been made, compression ratio remains the same.

(I have actually done this, and know how I need to adjust my jets, I just want to know the reasons behind it :NodYes:)
 

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making the squish band smaller will lower the squish velocity which affects combustion. You need a squish velocity calculator and then the final version of the head should still provide close to 20m/sec at peak power RPM
 
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