Hi F5,
Yeah did like you say, removed rear wheel got cylinder level with front propped up, greased the edge of the piston, wiped it clean to seal the rings. Measured to the top of the plug hole 25.2 then removed the head and measured the plug hole 2.5 ml , plug was 0.1ml so in total 22.8. why would gasgas design a head with massive squish and seemingly very high comp.? Could the port/ exhaust design warrant this comp ratio , had an older gasser with a S3 head with black high comp insert that was 13:1.
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