I wouldn't be surprised if I lost 5 psi or so with my gauge as its a rubber cone push on type you have to jam on when doing the reading (ie not screw fitting).
Before I had the head done I tried reducing base gasket thickness to 0.15mm (0.5mm stock) & this raised the compression to about 160 psi & reduced squish to 1.35mm.
This made it a bit harder to kick, improved jetting & spooge, but power delivery was not what you call smooth with a big kick coming into the mid range. Fun but not fast (for me).
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GG GP300 18
KTM 350EXC 17
GG EC 450, GG EC 250 08, KTM 525 EXC 06, KTM 400 EXC 01, XR400 97, VTR1000 98, VFR750 95, Husaberg FE400 96, RMX250 91, Maico 490 84, IT250J 81, RM250C2 79, Bultaco Alpina 250 77 - All sold
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