Yamaha 2009 YZF-R1 (Y) User Manual

ELECTRIC STARTER
5-48
EAS24790
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.
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
commutator.
TIP
The mica of the commutator must be undercut
to ensure proper operation of the commutator.
4. Measure:
• Armature assembly resistances (commu-
tator and insulation)
Out of specification → Replace the
starter motor.
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a. Measure the armature assembly resis-
tances with the digital circuit tester.
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 brush
holder.
Limit
23.5 mm (0.93 in)
Mica undercut (depth)
1.50 mm (0.06 in)
Digital circuit tester
90890-03174
Model 88 Multimeter with
tachometer
YU-A1927
Armature coil
Commutator resistance
0.0090–0.0110 Ω at 20 °C (68
°F)
Insulation resistance
Above 1 MΩ at 20 °C (68 °F)
1. Commutator resistance
2. Insulation resistance
Limit
7.19 mm (0.28 in)

Yamaha 2009 YZF-R1 (Y) Specifications

General

Bore x Stroke	78.0 mm x 52.2 mm
Compression Ratio	12.7:1
Fuel System	Fuel injection with YCC-T and YCC-I
Ignition	TCI: Transistor Controlled Ignition
Transmission	6-speed w/multiplate slipper clutch
Final Drive	Chain
Front Tire	120/70-ZR17
Rear Tire	190/55-ZR17
Seat Height	835 mm
Wet Weight	206 kg
Engine Type	Liquid-cooled, 4-stroke, DOHC, inline 4-cylinder
Front Suspension	43 mm inverted fork, fully adjustable
Rear Suspension	Single shock, fully adjustable
Front Brakes	Dual 310 mm discs, radial-mount 6-piston calipers
Rear Brakes	220 mm disc, single-piston caliper
Dimensions (L x W x H)	2, 070 mm x 715 mm x 1, 130 mm
Wheelbase	1415 mm
Fuel Capacity	18 L