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Cylinder head bolts
Tightening Torque
Remarks
1
st
step
2
nd
step
M10 × 75 mm :
①,②,③,④,
flange bolt : 4 pcs .
(14mm box wrench)
17 .0 - 19 .0 N
・
m
(170 - 190 kgf
・
cm)
(12 .3 - 13 .7 ft
・
lb .)
29 .0 - 31 .0 N
・
m
(290 - 310 kgf
・
cm)
(21 .0 - 22 .4 ft
・
lb .)
Re-use
37 .0 - 39 .0 N
・
m
(370 - 390 kgf
・
cm)
(26 .7 - 28 .2 ft
・
lb .)
When replace to new cylinder
head and flange bolts
M8 × 35 mm :
⑤,⑥
flange bolt : 2 pcs .
(12mm box wrench)
-
As for
⑤
and
⑥
, only 1
st
step
tightening .
(7) CHAIN GUIDE
Mount the chain guide to the crankcase .
Fig .3-37
CHAIN GUIDE
Fig .3-36
Models EX40
mounting positions
(8) CYLINDER HEAD
Inspect and repair any scratches on mounting surface and replace head gasket to new one before installing.
Fig .3-38
M8 x 35 BOLT : 2 pcs.
M10 x 75 BOLT : 4 pcs.
CYLINDER HEAD
DOWEL PIN
GASKET
1
2
3
4
5
6
1
2
3
4
Tighten the cylinder head bolts in diagonal order .
(1) Re-use (Oil the screw thread)
● Tighten all bolts (6pcs) by 18 ± 1 N
・
m primary,
and then tighten longer ones (M10 × 75mm
flange bolt: 4pcs) by 30 ± 1 N
・
m .
(2) When replace to new cylinder head and flange
bolts (Oil the screw thread)
● Tighten all bolts (6pcs) by 18 ± 1 N
・
m primary,
and then tighten longer ones (M10 × 75mm
flange bolt: 4pcs) by 38 ± 1 N
・
m .