5-25
CYLINDER AND PISTON
3. Measure:
• Piston ring end gap
Out of specification
→
Replace the piston
ring.
The oil ring expander spacer end gap cannot be
measured. If the oil ring rail gap is excessive, re-
place all three piston rings.
CHECKING THE PISTON PIN
1. Check:
• Piston pin
Blue discoloration/grooves
→
Replace the
piston pin and then check the lubrication sys-
tem.
2. Measure:
• Piston pin outside diameter “a”
Out of specification
→
Replace the piston pin.
3. Measure:
• Piston pin bore diameter “b”
Out of specification
→
Replace the piston.
4. Calculate:
• Piston-pin-to-piston-pin-bore clearance
Out of specification
→
Replace the piston pin
and piston as a set.
INSTALLING THE PISTON AND CYLINDER
1. Install:
• Top ring “1”
• 2nd ring “2”
• Oil ring expander “3”
• Lower oil ring rail “4”
• Upper oil ring rail “5”
Be sure to install the piston rings so that the
manufacturer marks or numbers face up.
Piston ring
Top ring
End gap (installed)
0.10–0.25 mm
Limit
0.40 mm
2nd ring
End gap (installed)
0.10–0.25 mm
Limit
0.40 mm
Oil ring
End gap (installed)
0.20–0.70 mm
Piston pin bore inside diameter
14.002–14.013 mm
Limit
14.043 mm
• Piston-pin-to-piston-pin-bore clearance =
Piston pin bore diameter “b” -
Piston pin outside diameter “a”
Piston-pin-to-piston-pin-bore
clearance
0.002–0.018 mm
Limit
0.068 mm
5-26
CYLINDER AND PISTON
2. Install:
• Piston “1”
• Piston pin “2”
• Piston pin clips “3”
NOTE:
• Apply engine oil the piston pin.
• Make sure the arrow mark “a” on the piston
points towards the exhaust side of the cylinder.
• Before installing the piston pin clip, cover the
crankcase opening with a clean rag to prevent
the clip from falling into the crankcase.
3. Lubricate:
• Piston
• Piston rings
• Cylinder
(with the recommended lubricant)
4. Offset:
• Piston ring end gaps
5. Install:
• Dowel pins
• Cylinder head gasket
• Cylinder “1”
NOTE:
• While compressing the piston rings with one
hand, install the cylinder with the other hand.
• Pass the timing chain and timing chain guide
(intake side) through the timing chain cavity.
Recommended lubricant
Engine oil
New
3
2
1
a
New
a. Top ring
b. Oil ring expander
c. Upper oil ring rail
d. Lower oil ring rail
e. 2nd ring
A. exhaust side
120º
120º
90º
45º
45º
120º
a
c
d
e
b
A
New
1
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 ...