Here some Measurements regarding the head.
Placing piston in top dead center
Measuring the Combustion volume.
Measured value: 12,2cc
Measuring the plughole (For future calculations)
Measured value: 2,1cc
Now the head is removed
Sadly it's damaged.
Using a glass plate to measure the head volume
Easy on the last part, filling the air bobble
Measured value: 12,3CC
What surprises me is that when the piston is in dead center it is not equally with the ports.
My first thoughts are this could be a problem for the measured values, but it turns out that my track bike has the same problem.
Will need to investigate this in the future
Here is the research engine
Here is the track bike
Measured Combustion volume
Measured head volume
Squish between 1,1 and 1,3mm
A 12,3cc head volume is not (extremely) high.
But the stock squish from 1,1 -
A pressed head gasket is about
So when removing the head gasket and go to a O-
Regarding the combustion volume when removing the head gasket.
Roughly calculated that every 0,1mm is a 0.252cc so the 0,4mm head gasget is 4 X 0,252 = 1,008cc