checking oil YAMAHA YZF-R1SC 2004 Workshop Manual

8-21
STARTER MOTORELEC
NOTE:
EAS00770
CHECKING THE STARTER MOTOR
1. Check:

commutator
Dirt
Clean with 600 grit sandpaper.
2. Measure:

commutator diameter
a
Out of specification
Replace the starter
motor.
Commutator wear limit
24.5 mm (0.96 in)
3. Measure:

mica undercut
a
Out of specification
Scrape the mica to the
proper measurement with a hacksaw blade
that has been grounded to fit the commuta-
tor.
Mica undercut
1.5 mm (0.06 in)
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:

armature assembly resistances (commuta-
tor and insulation)
Out of specification
Replace the starter
motor.
a. Measure the armature assembly resistances
with the pocket tester.
Pocket tester
90890-03112, YU-3112
Armature coil
Commutator resistance
1
0.0090  0.0110 Ω
at 20C (68F)
Insulation resistance
2
Above 1 MΩ at 20C (68F)
b. If any resistance is out of specification, re-
place the starter motor.
ProCarManuals.com

8-25
NOYES
3. Charging voltage

Set the engine tachometer to the ignition coil
of cylinder #1.

Connect the pocket tester (DC 20 V) to the
battery as shown.
The charging circuit
is OK. Positive tester probe

positive battery terminal
Negative tester probe

negative battery terminal

Start the engine and let it run at approxi-
mately 5,000 r / min.

Measure the charging voltage.
Charging voltage
14 V at 5,000 r / min

Is the charging voltage within specification?
EAS00775
YESNO

Clean the battery
terminals.

Recharge or re-
place the battery.
Make sure the battery is fully charged.
NOTE:
Minimum open-circuit voltage
12.8 V or more at 20C (68F)

Is the battery OK?
CHARGING SYSTEMELEC
NOTE:
YESNO
1. Main fuse

Check the main fuse for continuity.
Refer to “CHECKING THE FUSES” in chap-
ter 3.

Is the main fuse OK?
Replace the fuse.
2. Battery

Check the condition of the battery.
Refer to “CHECKING AND CHARGING
THE BATTERY” in chapter 3.
EAS00739 EAS00774
TROUBLESHOOTING
The battery is not being charged.
Check:
1. main fuse
2. battery
3. charging voltage
4. stator coil lead
5. stator coil resistance
6. wiring connections
(of the entire charging system)

Before troubleshooting, remove the following
part(s):
1. seat
2. fuel tank

Troubleshoot with the following special tool(s).
Pocket tester
90890-03112, YU-3112
EAS00738
ProCarManuals.com