1998 Yamaha 25J, 30D, 25X, 30X outboards Factory Service Manual, Page 72Get this manual
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INSPECTION
2 Insert th pisto rin into th cylin erU sin pisto n, ush th pisto rin little th otto of th rin tra el to pth of 20 (0.8 in) fro th to of th cylin er block
CAUTION: