Yamaha XT660R S Service Manual page 409

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STARTER MOTOR
Pocket tester
90890-03112
Armature coil
Commutator resistance 1
0.025 ~ 0.035 Ω at 20 °C (68 °F)
Insulation resistance 2
Above 1 MΩ at 20 °C (68 °F)
b. If any resistance is out of specification,
replace the starter motor.
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5. Measure:
• brush length a.
Out of specification → Replace the brushes
as a set.
Brush length wear limit
5.00 mm (0.20 in)
6. Measure:
• brush spring force
Out of specification → Replace the brush
springs as a set.
Brush spring force
7.65 ~ 10.01 N
(780 ~ 1,021 gf, 27.51 ~ 36.01 oz)
7. Check:
• gear teeth
Damage/wear → Replace the gear.
8. Check:
• bearing
• oil seal
Damage/wear → Replace the defective
part(s).
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ELEC
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