1997 Johnson/Evinrude EU 25, 35 HP 3-Cylinder outboards Service Manual, Page 137Get this manual
6Use telescoping gauge or inside-reading micrometer 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 mm)
rn 8The dimension cylinder taper
difference between the two areas is
The cylinder taper must not exceed 0.002 in(0,05 mm)
rn 9The difference between your measurements andSpecificastandard bore dimension is cylinder oversizeRefer to Engine
tions, Section 1, for dimensions The cylinder must not be oversized by more than 0.004 in(0,10 mm)"-._ _