3-8
3-9
ENGINE
ENGINE
2. Remove:
l
Seat
Refer to “GENERAL CHASSIS” on page 4-1.
3. Lift the front of the fuel tank. (Do not discon-
nect the fuel hose.)
4. Connect:
l
Timing light “1”
l
Digital tachometer
5. Check:
l
Ignition timing
a. Start the engine, warm it up for several min-
utes, and then let it run at the specified en-
gine idling speed.
b. Check that stationary pointer “a” in the magn-
eto cover is within the firing range “b” on the
magneto rotor.
Incorrect firing range
→
Check the ignition
system.
NOTE:
The ignition timing is not adjustable.
6. Remove:
l
Digital tachometer
l
Timing light
7. Install:
l
Fuel tank
Refer to “FUEL TANK ” on page 7-1.
l
Seat
Refer to “GENERAL CHASSIS” on page 4-1.
8. Install:
l
Timing mark accessing screw
(along with the O-ring
)
MEASURING THE COMPRESSION
PRESSURE
NOTE:
Insufficient compression pressure will result in a
loss of performance.
1. Measure:
l
Valve clearance
Out of specification
→
Adjust.
Refer to “ADJUSTING THE VALVE CLEAR-
ANCE” on page 3-3.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Remove:
l
Right front panel
Refer to “GENERAL CHASSIS” on page 4-1.
4. Disconnect:
l
Spark plug cap
5. Remove:
l
Spark plug
CAUTION:
Before removing the spark plug, use com-
pressed air to blow away any dirt accumulat-
ed in the spark plug wells to prevent it from
falling into the cylinder.
6. Remove:
l
Seat
Refer to “GENERAL CHASSIS” on page 4-1.
7. Lift the front of the fuel tank. (Do not discon-
nect the fuel hose.)
8. Install:
l
Compression gauge “1”
Timing light
Engine idling speed
1300–1500 r/min
Compression gauge
New
ssssssssssssssssssssssss
ssssssssssssssssssssssss
9. Measure:
l
Compression pressure
Out of specification
→
Refer to steps (c) and
(d).
a. Set the main switch to ON”.
b. With the throttle wide open, crank the engine
until the reading on the compression gauge
stabilizes.
c. If the compression pressure is above the
maximum specification, check the cylinder
head, valve surfaces and piston crown for
carbon deposits.
Carbon deposits
→
Eliminate.
d. If the compression pressure is below the min-
imum specification, pour a teaspoonful of en-
gine oil into the spark plug bore and measure
again.
Refer to the following table.
10.Remove:
l
Compression gauge
11.Install:
l
Fuel tank
Refer to “FUEL TANK ” on page 7-1.
l
Seat
Refer to “GENERAL CHASSIS” on page 4-1.
12.Install:
l
Spark plug
13.Connect:
l
Spark plug cap
14.Install:
l
Right front panel
Refer to “GENERAL CHASSIS” on page 4-1.
CHECKING THE ENGINE OIL LEVEL
1. Stand the vehicle on a level surface.
NOTE:
l
Place the vehicle on the centerstand.
l
Make sure the vehicle is upright.
2. Start the engine, warm it up for several min-
utes, and then turn it off.
3. Check:
l
Engine oil level
The engine oil level should be between the
minimum level mark “a” and maximum level
mark “b”.
Below the minimum level mark
→
Add the
recommended engine oil to the proper level.
NOTE:
l
Before checking the engine oil level, wait a few
minutes until the oil has settled.
l
Do not screw the dipstick “1” in when checking
the oil level.
Compression pressure (with oil applied into
the cylinder)
Reading
Diagnosis
Higher than without
oil
Piston ring(s) wear or
damage
→
Repair.
Same as without oil
Piston, valves, cylin-
der head gasket or
piston possibly defec-
tive
→
Repair.
Standard compression pressure
55 Psi (3.866 kg/cm )
²
1
T
R
.
.
Spark plug
13 Nm (1.3 m·kg, 9.4 ft·lb)
Type
SAE20W40 (YAMALUBE-4 stroke
1
b
1
a
ssssssssssssssssssssssss
ssssssssssssssssssssssss
motor oil)
Summary of Contents for YZF-R15
Page 1: ...2008 SERVICE MANUAL YZF R15 20P F8197 E0 ...
Page 33: ...2 14 ELECTRICAL SPECIFICATIONS Coil resistance 54 0 66 0 Fuse 20 0A Ω Fuse ...
Page 46: ...2 27 LUBRICATION POINTS AND LUBRICANT TYPES LUBRICATION DIAGRAMS A 1 2 3 4 5 6 7 ...
Page 48: ...2 29 LUBRICATION POINTS AND LUBRICANT TYPES 1 2 3 4 ...
Page 49: ...2 30 LUBRICATION POINTS AND LUBRICANT TYPES 1 Camshaft 2 Crankshaft 3 Main axle 4 Drive axle ...
Page 50: ...2 31 COOLING SYSTEM DIAGRAMS COOLING SYSTEM DIAGRAMS 1 2 3 4 1 5 7 6 4 ...
Page 52: ...2 33 CABLE ROUTING CABLE ROUTING 1 5 2 3 6 4 8 7 ...
Page 54: ...2 35 CABLE ROUTING A A B B C C A A C C B B A B C 1 2 3 4 5 4 5 6 6 7 8 9 10 11 10 11 12 12 ...
Page 56: ...2 37 CABLE ROUTING 1 2 5 4 3 ...
Page 60: ...2 41 CABLE ROUTING A A B C D E 1 2 3 4 5 6 7 8 9 10 A ...
Page 121: ...4 24 FRONT BRAKE Refer to BLEEDING THE HYDRAULIC BRAKE SYSTEM on page 3 18 ...
Page 249: ...7 8 THROTTLE BODY ...
Page 250: ...7 9 AIR INDUCTION SYSTEM AIR INDUCTION SYSTEM 1 2 5 4 5 6 3 2 1 6 4 3 ...
Page 257: ......
Page 269: ...8 12 CHARGING SYSTEM 1 AC magneto 2 Rectifier regulator 3 Battery 42 Fuse ...
Page 271: ...8 14 CHARGING SYSTEM ...
Page 275: ...8 18 LIGHTING SYSTEM ...
Page 285: ...8 28 COOLING SYSTEM ...
Page 311: ...8 54 FUEL PUMP SYSTEM ...