Mercury Mariner Service Manual 6, 8, 9.9 210CC Sailpower, Page 77Get this manual
MEASURING PISTON
REED OPENING)
1Measure piston skirt at right angle (90 pin centerline
to piston
NOTE: Drawing shows exaggerated piston barrel shape
1Check reeds to be sure that they are not preloaded (adhere tightly to reed block) and that they are not standing open an excessive amount [greater than 0.007" (0.178mm)] Replace reeds if necessary
2.123 (53.92mm)
PISTON CLEARANCE
0.10" (2.54mm)
Minimum Bore Measurement -Maximum Piston Measurement
aFeeler GaugeReed