1999 EE Johnson Outboards 25, 35 3-Cylinder Service Manual, Page 136Get this manual
6Use Cylinder Bore Gauge, PI 771310, to inspect each cylinder bore for an out-of-round, oversize, or tapered conditionBe sure the gauge or micrometer is perfectly square in the bore when measuring
rn 7Measure each cylinder twiceThe difference between the in at least two areas as shownEach area should be measured
two measurements in each area is the cylinder out-of-round dimension The cylinder must not be out-of-round by more than 0.004 in(0,10 mml
rn 8The dimension cylinder taper
difference between the two areas is