Yamaha 2010 YZF-R6, Manual Instruction

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Measuring the volume of the cylinder head combustion chamber
TIP
To obtain the highest performance for race use, the four cylinders should be uniform.
If you modify the head cylinder, always measure the combustion chamber volume and
do the work based on the measured value.
Measure the volume of the combustion chamber of the cylinder head (commonly called the
dome volume) as follows.
Measuring equipment
1. Burette
2. Glass plate
3. Oil (3:1 mixture of torque converter oil and white gasoline)
4. Vaseline (to seal the valve and glass plate)
Measurement method
1. Tighten a regulation spark plug to the regulation torque in the cylinder head to be
measured.
2. Set so that the alignment surface of the combustion chamber is level.
3. Apply a thin coat of Vaseline to the valve face and set the IN and EX valves.
4. Apply a thin coat of Vaseline to the combustion chamber alignment surface and set the
glass plate.
5. Add drops of oil from the burette. The total added amount minus the valve back clearance
is the volume of the combustion chamber.