Yamaha RS90GTZ Service Manual page 386

ELECTRICAL STARTING SYSTEM
4. Measure:
Inspecting steps:
• Connect the analog pocket tester (pocket
tester) for the continuity check
insulation check
• Measure the armature coil resistances.
• If the resistance is incorrect, replace the
starter motor.
5. Measure:
6. Measure:
7. Inspect:
8-20
• Armature coil resistance
(insulation/continuity)
Out of specification → Replace the starter
motor.
.
Armature coil resistance:
Continuity check:
0.0081 ~ 0.0099 Ω at 20 °C
(68 °F)
Insulation check:
Above 1 MΩ at 20 °C (68 °F)
• Brush length
Out of specification → Replace the brush
set.
Brush length wear limit:
4.4 mm (0.17 in)
• Brush spring pressure
Fatigue/out of specification → Replace the
brush set.
Brush spring pressure:
7.36 ~ 11.04 N
(750 ~ 1,126 gf, 26.49 ~ 39.74 oz)
• Bearings
(inside the front bracket and rear bracket)
• Oil seal
(inside the front bracket)
Damage/wear → Replace the starter
motor.
ELEC
and the