Specifications

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8
2.3 - Practical Method
2.3.1 – Measurement of piston volume
The method of measurement of piston volume should be adapted to piston top
shape. The simpler case is flat piston (YZF-R1 OEM parts). In that case, the piston
never protrude cylinder upper face.
Racing pistons or standard R6 piston have top shape which rise upper cylinder face.
The pictures below are shot on an R6 engine (with roof piston).
The first stage consist to reach TDC following the
method described during squish measurement.
Once the piston is at TDC, it is necessary to move
down the piston in order to put piston top under
cylinder face. With squish measurement tool, the
piston moved down of 3 mm precisely.
Then Plexiglas plate is “sealed” on cylinder body by
grease.