Yamaha YZF-R7 User Manual

8 - 10
–+
ELEC
IGNITION SYSTEM
MEASURING THE IGNITION COIL
RESISTANCE
The following procedure applies to all of
the ignition coils.
• Remove the ignition coil from the cylinder
head.
• Connect the pocket tester (Ω × 1) to the
ignition coil as shown.
• Measure the primary coil resistance.
• Connect the pocket tester (Ω × 1k) to the
ignition coil as shown.
• Measure the secondary coil resistance.
• Is the ignition coil OK?
Yes → Good.
No → Replace.
MEASURING THE PICKUP COIL
RESISTANCE
• Disconnect the pickup coil coupler from
the wire harness.
• Connect the pocket tester (Ω × 100) to the
pickup coil coupler.
• Measure the pickup coil resistance.
• Is the pickup coil OK?
Yes → Good.
No → Replace.
Tester positive probe →
orange (cylinder #1) 1
gray (cylinder #2)
gray/green (cylinder #3)
orange/green (cylinder #4)
Tester negative probe → black 2
Primary coil resistance
0.16 ~ 0.21 Ω at 20˚C (68˚F)
Tester positive probe →
orange (cylinder #1) 1
gray (cylinder #2)
gray/green (cylinder #3)
orange/green (cylinder #4)
Tester negative probe →
ignition coil hole 3
Secondary coil resistance
5.0 ~ 6.8 kΩ at 20˚C (68˚F)
Tester positive probe → gray 1
Tester negative probe → black 2
Pickup coil resistance
421 ~ 569 Ω at 20˚C (68˚ F)
(between gray and black)
3
1
2

Yamaha YZF-R7 Specifications

General

Bore x Stroke	80.0mm x 68.6mm
Compression Ratio	11.5:1
Fuel Delivery	Fuel injection
Final Drive	Chain
Front Brakes	Dual 298mm hydraulic disc; ABS
Rear Brakes	245mm hydraulic disc; ABS
Front Tire	120/70ZR17
Rear Tire	180/55ZR17
Wheelbase	54.9 in
Seat Height	32.9 in
Fuel Capacity	3.4 gal
Wet Weight	414 lb
Ground Clearance	5.3 in
Engine Type	Liquid-cooled, 4-stroke, DOHC, 4-valves
Transmission	6-speed
Front Suspension	41mm KYB inverted fork, adjustable preload, rebound and compression damping; 5.1-in travel
Rear Suspension	Single shock, adjustable preload and rebound damping; 5.1-in travel