1999 YAMAHA YZF-R7 fuel type

EB004000
SYMBOLS
The following symbols are not relevant to
every vehicle.
Symbols
1
to
9
indicate the subject of
each chapter.
1
General information
2
Specifications
3
Periodic checks and adjustments
4
Overhauling the engine
5
Cooling system
6
Electronic fuel injection
7
Chassis
8
Electrical
Symbols
9
to
F
indicate the following.
9
Serviceable with engine mounted
0
Filling fluid
A
Lubricant
B
Special tool
C
Tightening torque
D
Wear limit, clearance
E
Engine speed
F
Electrical data
Symbols
G
to
L
in the exploded diagrams
indicate the types of lubricants and lubrica-
tion points.
G
Engine oil
H
Gear oil
I
Molybdenum disulfide oil
J
Wheel bearing grease
K
Lithium soap base grease
L
Molybdenum disulfide grease
Symbols
M
to
N
in the exploded diagrams
indicate the following.
MApply locking agent (LOCTITE
â)
NReplace the part 12
34
56
78
90
AB
CD
E F
GHI
JKL
M N
SPEC
CHK
ADJENG
COOLEFI
CHAS–+ELEC
T R..
GME
BLSM
LTNew

ENGINE SPECIFICATIONS
SPEC

2 - 2
ENGINE SPECIFICATIONS
Item Standard Limit
Engine
Engine type Liquid-cooled, 4-stroke, DOHC ----
Displacement 749 cm
3

----
Cylinder arrangement Forward-inclined parallel 4-cylinder ----
Bore
´
stroke 72
´
46 mm (2.83
´
1.81 in) ----
Compression ratio 11.4:1 ----
Engine idling speed 1,000 ~ 1,200 r/min ----
Vacuum pressure at engine idling
speed15.8 ~ 18.4 kPa
(120 ~ 140 mm Hg, 4.72 ~ 5.51 in Hg)----
Standard compression pressure
(at sea level) 157 kPa
(1.57 kgf/cm
2

, 22.3 psi) at 500 r/min----
Fuel
Recommended fuel Premium unleaded gasoline ----
Fuel tank capacity
Total (including reserve) 23 L (20.2 Imp qt, 24.3 US qt) ----
Reserve only 4.8 L (4.22 Imp qt, 5.07 US qt) ----
Engine oil
Lubrication system Wet sump ----
Recommended oil
Yamalube 4 (20W40) or SAE 20W40 type
SE motor oil (40˚F/5˚C or above)
(Non-Friction modified)
Yamalube 4 (10W40) or SAE 10W40 type
SE motor oil (60˚F/15˚C or below)
(Non-Friction modified)----
Quantity
Total amount 3.6 L (3.2 Imp qt, 3.8 US qt) ----
Without oil filter cartridge
replacement2.6 L (2.3 Imp qt, 2.7 US qt) ----
With oil filter cartridge replace-
ment2.8 L (2.5 Imp qt, 3.0 US qt) ----
Oil pressure (hot) 40 kPa (0.4 kgf/cm
2

, 5.69 psi) at
1,100 r/min ----
Relief valve opening pressure 480 ~ 560 kPa
(4.8 ~ 5.6 kgf/cm
2

, 68.3 ~ 79.7 psi)----
2

ENGINE SPECIFICATIONS
SPEC

2 - 10
Clutch plates
Thickness 1.5 ~ 1.7 mm (0.059 ~ 0.067 in) ----
Plate quantity 8 ----
Maximum warpage ---- 0.1 mm
(0.004 in)
Clutch springs
Free length 7.1 mm (0.280 in) ----
Spring quantity 1 spring per valve ----
Transmission
Transmission type Constant mesh, 6-speed ----
Primary reduction system Spur gear ----
Primary reduction ratio 88/47 (1.872) ----
Secondary reduction system Chain drive ----
Secondary reduction ratio 43/17 (2.529) ----
Operation Left-foot operation ----
Gear ratios
1st gear 38/17 (2.235) ----
2nd gear 36/19 (1.895) ----
3rd gear 35/21 (1.667) ----
4th gear 33/23 (1.435) ----
5th gear 31/24 (1.292) ----
6th gear 27/23 (1.174) ----
Maximum main axle runout ---- 0.08 mm
(0.003 in)
Maximum drive axle runout ---- 0.08 mm
(0.003 in)
Shifting mechanism
Shift mechanism type Shift drum ----
Maximum shift fork guide bar
bending ---- 0.05 mm
(0.002 in)
Installed shift rod length 294 mm (11.57 in) ----
Air filter type
Dry element ----
Fuel pump
Pump type Electrical ----
Model (manufacturer) 5FL (MITSUBISHI) ----
Output pressure 450 ~ 600 kPa
(4.5 ~ 6.0 kgf/cm
2

, 64 ~ 85 psi)----
Throttle bodies
ID mark 5FL1 ----
Throttle valve #100 ----
Intake vacuum pressure 15.8 ~ 18.4 kPa
(120 ~ 140 mmHg, 4.72 ~ 5.51 in Hg)----
Throttle cable free play (at the
flange of the throttle grip)3 ~ 5 mm (0.12 ~ 0.20 in) ---- Item Standard Limit

ELECTRICAL SPECIFICATIONSSPEC
2 - 16
Electric starting system
System type Constant mesh ----
Starter motor
Model (manufacturer) SM-14 (MITSUBA) ----
Power output 0.6 kW ----
Armature coil resistance 0.0015 ~ 0.0025 W----
Brushes
Overall length 10 mm (0.40 in) 3.5 mm
(0.14 in)
Spring force 7.16 ~ 9.52 N
(730 ~ 971 gf, 25.8 ~ 34.3 oz)----
Commutator resistance 0.025 ~ 0.035 W----
Commutator diameter 28 mm (1.10 in) 27 mm
(1.06 in)
Mica undercut 0.7 mm (0.03 in) ----
Starter relay
Model (manufacturer) MS5F-631 (JIDECO) ----
Amperage 180 A ----
Coil resistance 4.18 ~ 4.62 W ----
Horn
Horn type Plain ----
Model (manufacturer) ´ quantity YF-12 (NIKKO) ´ 1 ----
Max. amperage 3 A ----
Turn signal relay
Relay type Full-transistor ----
Model (manufacturer) FE246BH (DENSO) ----
Self-cancelling device built-in No ----
Turn signal blinking frequency 75 ~ 95 cycles/min. ----
Wattage 21 W ´ 2 + 3.4 W ----
Oil level switch model (manufac-
turer)071380-0480 (DENSO) ----
Fuel pump relay model (manufac-
turer)G8R-30Y-J (OMRON) ----
Thermo switch model (manufac-
turer)5EB (NIPPON THERMOSTAT) ----
Fuses (amperage ´ quantity)
Main fuse 30 A ´ 1 ----
Headlight fuse 20 A ´ 1 ----
Signaling system fuse 20 A ´ 1 ----
EFI fuse 20 A ´ 1 ----
ECU fuse 7.5 A ´ 1 ----
Radiator fan fuse 7.5 A ´ 1 ----
Backup fuse (odometer) 7.5 A ´ 1 ---- Item Standard Limit

3 - 19
CHK
ADJADJUSTING THE THROTTLE CABLE FREE PLAY/
CHECKING THE SPARK PLUGS
Handlebar side
a. Loosen the locknut 4.
b. Turn the adjusting nut 5 in direction
c or d until the specified throttle
cable free play is obtained.
c. Tighten the locknut.
WARNINGWARNING
After adjusting the throttle cable free
play, start the engine and turn the han-
dlebars to the right and to the left to
ensure that this does not cause the
engine idling speed to change.
s s s s s s s s s s s s s s s s s s s s s s s s s s s
Direction cThrottle cable free play
is increased.
Direction dThrottle cable free play
is decreased.
C C
d d
7
7
5
57
7
4
4
EB303040
CHECKING THE SPARK PLUGS
The following procedure applies to all of
the spark plugs.
1. Remove:
• fuel tank
• air filter case cover
Refer to “FUEL TANK AND AIR FIL-
TER”.
• air filter case
Refer to “ELECTRONIC FUEL INJEC-
TION” in chapter 6.
2. Disconnect:
• ignition coil couplers
3. Remove:
• ignition coils
• spark plug
ACHTUNG:CAUTION:
Before removing the spark plugs, blow
away any dirt accumulated in the spark
plug wells with compressed air to pre-
vent it from falling into the cylinders.
4. Check:
• spark plug type
Incorrect ® Change.
Spark plugs
Model (manufacturer)
R0256R-10 (NGK)