Mercury Mariner 25HP 4-Stroke Outboard Service Manual 1997, Page 10Get this manual
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Warp Limit
1.45671.4577 in(37.00037.025 mm)
ValveNalve SeatiValve Guides: Valve Clearance (cold) Intake Exhaust Valve Dimensions: "A" Head Diameter Intake Exhaust "8 Face Wid