Yamaha N MAX GPD150-A 2015, Service Manual

Page: 262 / 450

CYLINDER AND PISTON
5-33
• Upper oil ring rail “3”
• 2nd ring “4”
• Top ring “5”
TIP
Be sure to install the piston rings so that the
manufacturer marks face up.
2. Install:
• Piston “1”
• Piston pin “2”
• Piston pin clips “3”
TIP
• Apply engine oil to the piston pin.
• Make sure the punch mark “a” on the piston
points towards the exhaust side of the cylinder.
• Before installing the piston pin clips, cover the
crankcase opening with a clean rag to prevent
the clips from falling into the crankcase.
• When installing a piston pin clip, make sure
that the clip ends “b” are positioned away from
the cutout “c” in the piston as shown in the illus-
tration.
3. Lubricate:
• Piston
• Piston rings
• Cylinder
(with the recommended lubricant)
4. Offset:
• Piston ring end gaps
5. Install:
• Dowel pins
• Cylinder gasket
• Cylinder “1”
TIP
• While holding the piston “2” with one hand, in-
stall the cylinder with the other hand.
• Pass the timing chain and timing chain guide
(intake side) through the timing chain cavity.
5
4
3
2
1
New
New
1
a
2
3
1
3
2
b
c
New
Recommended lubricant
Engine oil
a. Top ring
b. 2nd ring
c. Upper oil ring rail
d. Oil ring expander
e. Lower oil ring rail
A. Exhaust side
45˚ 45˚
45˚ 45˚
135˚
A
e d
c
b a
New
1
2