Mercury Optimax Models 135, 150, Direct Fuel Injection., Page 354Get this manual
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RIGHT HAND NON-RATCHETING
Ratio Pinion Depth Forward Gear Backlash 0.018 into 0.027 in(0.460 mm to 0.686 mm) Pointer on line mark #1 Reverse Gear Backlash 0.030 into 0.050 in(0.762 mm to 1.27 mm