Yamaha MBK X-MAX 300 2017 Service Manual page 214

Cylinder head nut
1st: 16 N·m (1.6 kgf·m, 12 lb·ft)
*2nd: 16 N·m (1.6 kgf·m, 12 lb·ft),
and then tighten the bolts to the
specified angle 180°
Cylinder head bolt
10 N·m (1.0 kgf·m, 7.4 lb·ft)
*Following the tightening order, loosen the
bolt one by one, and then retighten it to the
specific torque (after loosening the bolt, re-
tighten it before loosening the next bolt).
TIP
• Lubricate the cylinder head nuts and washers
with molybdenum disulfide grease.
• Replace the cylinder head bolts, nuts and
washers with new ones.
• Tighten the cylinder head nuts and bolts in the
proper tightening sequence as shown.
4
1
2
6
2
2. Align:
• Mark "a" on the generator rotor
(with the slots "b" in the generator rotor cover)
a. Turn the crankshaft clockwise.
b. Position the mark "a" on the generator ro-
tor on both sides of the slots "b" in the gen-
erator rotor cover.
3. Install:
• Camshaft sprocket "1"
• Timing chain "2"
• Camshaft sprocket bolts
1
1
×4
3
×2
5
b
a
a. Install the timing chain onto the camshaft
sprocket, then the camshaft sprocket onto
the camshaft, and then finger tighten the
camshaft sprocket bolts.
ECA20600
NOTICE
Do not turn the crankshaft when installing
the camshaft sprocket to avoid damage or
improper valve timing.
TIP
Align the "I" mark "a" on the camshaft sprocket
with the match mark "b" on the cylinder head.
b
b. While holding the camshaft, temporarily
tighten the camshaft sprocket bolts.
4. Install:
• Timing chain tensioner gasket
• Timing chain tensioner
a. Remove the timing chain tensioner cap
bolt "1", washer "2" and spring "3".
b. Release the timing chain tensioner one-
way cam "4" and push the timing chain
tensioner rod "5" all the way into the timing
chain tensioner housing.
4
5
New
c. Install the gasket and the timing chain ten-
sioner "6" onto the cylinder.
EWA17620
WARNING
Always use a new gasket.
5-19
CYLINDER HEAD
a
2
1
New
1
2
New
3