1991 Johnson Evinrude EI 60 Loop V Models 150, 175 outboards Service Manual, Page 137Get this manual
f51 7Measure each cylinder in at least two areas as shownEach area should be measured twiceThe difference between the 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) f51 8The dimension difference between the two areas is cylinder
The cylinder taper must not exceed 0.002 in(0,05 mm)
1sl 9The difference between your measurements and standard
bore dimension is cylinder oversizeRefer to Engine Specifications, Section 1, for dimensions The cylinder must not be oversized by more than 0.004 in(0,10 mm)If any cylinder is outside these tolerances, it must be bored oversizeIt is permissible to have one or more oversize pistons in an engineRefer to Engine Specifications, Section 1
El two measurements, 90 from each otherMeasure the piston
diameter 114 in(6,4 mm) above the bottom edge ofthe piston skirt