Yamaha Outboard F15A F9.9C, FT9.9D F15 Service Manual, Page 488Get this manual

STARTER MOTOR (EHE MODELS)
Brush holder inspection 1Measure: Brush length Out of specification Replacea Brush length limit: 6.4 mm (0.25 in)

2Check: Brush unit continuity Out of specification ReplaceBrush unit continuity:

• ATV
• Jet Ski
• Outboard Motors
• Personal Watercraft
• Snowmobiles
• Stern Drives