Yep, stock squish tends to be around 1.2mm

R barrels, SP heads results in around 1mm and a head volume with stock head profiles that is normally considered to be pushing it's luck a bit on normal unleaded pump fuel and besides NSR's don't take well to high compression.

For info, on the NF5 if you set the head volumes to the recommended 11.5-11.7cc (which if you read the post Tuckerbag linked you can see is identical to the F3 NSR) you end up with a squish around 0.8mm.

Which agrees with conventional thinking that 0.8mm or less (if crank tolerances allow) is optimal, but this does not mean that if you have a conventional NSR setup (1.2mm squish) that you should go to R barrels, SP heads and 0.4 gaskets which would bring it down to 0.9mm as that will also remove 0.6cc from the head volume which may be (is) too much.

To test if just altering the squish makes things better or worse is a time consuming process.
Lets say you've got a motor that has a squish of 1mm and you want to test 0.8mm.
You need two more heads with 0.2mm missing from their face but with 0.4cc extra volume machined into the dome of the head itself.
Then you need to go to the dyno, run the bike, swap the heads, run the bike again.
A lot of effort for maybe no result at all.
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