Checking The Camshaft Sprocket; Checking The Timing Chain Tensioner; Installing The Cylinder Head - Yamaha MBK X-MAX 300 2017 Service Manual

• Cylinder head water jacket
Mineral deposits/rust → Eliminate.
3. Measure:
• Cylinder head warpage
Out of specification → Resurface the cylinder
head.
Warpage limit
0.05 mm (0.0020 in)
a. Place a straightedge "1" and a thickness
gauge "2" across the cylinder head.
1
b. Measure the warpage.
c. If the limit is exceeded, resurface the cylin-
der head as follows.
d. Place 400–600 grit wet sandpaper on the
surface plate and resurface the cylinder
head using a figure-eight sanding pattern.
TIP
To ensure an even surface, rotate the cylinder
head several times.
EAS31232

CHECKING THE CAMSHAFT SPROCKET

1. Check:
• Camshaft sprocket
More than 1/4 tooth wear "a" → Replace the
camshaft sprocket, timing chain and crank-
shaft as a set.
2
5-18
CYLINDER HEAD
a. 1/4 tooth
b. Correct
1. Timing chain roller
2. Camshaft sprocket
EAS30279

CHECKING THE TIMING CHAIN TENSIONER

1. Check:
• Timing chain tensioner
Cracks/damage → Replace.
2. Check:
• One-way cam operation
Rough movement → Replace the timing
chain tensioner assembly.
3. Check:
• Timing chain tensioner cap bolt "1"
• Washer "2"
• Timing chain tensioner spring "3"
• One-way cam "4"
• Timing chain tensioner gasket "5"
• Timing chain tensioner rod "6"
Damage/wear → Replace the defective
part(s).
5
4
EAS30282

INSTALLING THE CYLINDER HEAD

1. Tighten:
• Cylinder head nuts "1"
• Cylinder head bolts "2"
3 2 1
6