2007-2009 Yamaha F15/F20 Outboard Service Manual, Page 36Get this manual
Maintenance specification Item Commutator Standard diameter Wear limit Standard undercut Wear limit Pinion stopper height Unit mm (in) mm (in) mm (in) mm (in) mm (in) F15MHF Model F15EHF F20MHF 30.0 (1.18) 29.0 (1.14) 0.8 (0.03) 0.2 (0.01) 26.5 28.5 (1.04 1.12) 20 F20EHF 30.0 (1.18) 29.0 (1.14) 0.8 (0.03) 0.2 (0.01) 26.5 28.5 (1.04 1.12) 20
Charging system Fuse Lighting coil output peak voltage (G G) at cranking (unloaded) at 1,500 rmin (unloaded) at 3,500 rmin (unloaded) Lighting coil resistance(1) (G G) at 20 (68 F) Rectifier Regulator output peak voltage (R B) at 1,500 rmin (unloaded) at 3,500 rmin (unloaded)