2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 318Get this manual
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Power tilt motor service data Item Brush length Wear limit Commutator diameter Diameter limit Commutator under cut Under cut limit mm 6.0 3.0 16.5 15.5 1.0 0.5 inch 0.24 0.12 0.65 0.61 0.04 0.02