1998-2006 Yamaha F20/F25 Outboards Service Manual, Page 353Get this manual
[BRKTI1Ir I_P_TT M_O_TO RC_E 5Measure: Brush length Out of specification Replace
Brush length limit: mm (0.12 in)
6Inspect: PTT motor base Cracksdamage Replace7Inspect: Stator bushing PTT motor base bushing Cracksdamage Replace 8Inspect: PTT motor base oil seal Damagewear Replace