Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 401Get this manual

Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 401

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LEFT HAND NON-RATCHETING
Gear Housing Specifications (Counter Rotation)
Ratio 1.87:1 Pinion Depth 0.025 in(0.635 mm) With Tool 91-12349A2 using Disc #2 and Flat #7 Forward Gear Backlash 0.