Yamaha F400A 2022 - Assembling the Cylinder Block

7-92
Cylinder block
Assembling the cylinder block
1. Install:
•Dowel
•Pickup rotor
• Drive gear
TIP:
Tighten the drive gear bolts “1” to the speci-
fied torque in the order [1], [2], and so on.
2. Assemble:
•Piston
• Connecting rod
•Piston pin
• Piston clips
• Piston rings
a. Assemble the piston “1”, connecting
rod “2”, piston pin “3”, and new piston
pin clips “4”.
TIP:
• Face the mark “a” on the connecting rod “2”
in the same direction as the mark “b” on the
piston crown.
• Make sure that the clip “4” end is not aligned
with the groove “c” in the piston pin boss.
b. Install the oil rings “1”, 2nd ring “2”,
and top ring “3”.
Do not scratch the pistons or break the pis-
ton rings.
TIP:
• Make sure that the “2R” mark “a” on the 2nd
ring “2” and “1R” mark “b” on the top ring
“3” are facing up.
• Make sure that the piston rings move
smoothly.
c. Offset the piston ring end gaps.
3. Install:
• Crankshaft journal bearings (cylinder
block side) “1”
T
R
.
.
Drive gear bolt “1”
10 N·m (1.0 kgf·m, 7.4 lb·ft)
[5][5]
[2][2]
[4][4]
[6][6]
[1][1]
[3][3]
[5][5]
[2][2]
[4][4]
[6][6]
[1][1]
[3][3]
[5][5]
[2][2]
[4][4]
[6][6]
[1][1]
[3][3]
1
New
4
3
1
4
2
4
c
a
b
EE
#3
#4
#5
#1
#2
#3
#4
#5
#1
#2
45˚ 45˚
1
2
3
a
b
EE