Yamaha XV19SX(C) Service Manual page 301

NOTE:
Be sure to install the piston rings so that the
manufacturer's marks or numbers face up.
2. Install:
• Piston "1"
• Piston pin "2"
• Piston pin clips "3" New
NOTE:
• Apply engine oil onto the piston pin.
• Make sure the arrow mark "a" on the piston fac-
es towards the front of the vehicle.
• Before installing the piston pin clips, cover the
crankcase opening with a clean rag to prevent
the clip from falling into the crankcase.
• Install the piston pin clips, so that the clip ends
are 3 mm (0.12 in) "b" or more from the cutout
in the piston.
• Reinstall each piston into its original cylinder
(numbering order starting from the left: #1 to
#2).
b
3
New
5-52
CYLINDERS AND PISTONS
3. Lubricate:
• Piston
• Piston rings
• Cylinder
(with the recommended lubricant)
Recommended lubricant
Engine oil
4. Offset:
• Piston ring end gaps
A
90 ˚
d.e
a. Top ring
b. Upper oil ring rail
c. Oil ring expander
d. Lower oil ring rail
e. 2nd ring
A. forward
5. Install:
• Cylinder "1"
NOTE:
While compressing the piston rings with one
hand, install the cylinder with the other hand.
1
b
90 ˚
a.c
45 ˚