Mercury Optimax 75, 90, 115, DFI starting year 2004 service manual., Page 344Get this manual

Quality of the image is intentionally reduced!

POWERHEAD
Pistons have two half keystone (half tapered) rings0.078 in(1.98 mm)

0.078 in(1.98 mm)

ob00793

aHalf keystone (half tapered) piston ringEnlarged

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