Yamaha MBK X-MAX 300 2017 Service Manual page 77

• Muffler assembly
Refer to "ENGINE REMOVAL" on page 5-7.
• Cylinder head cover
Refer to "CYLINDER HEAD" on page 5-13.
2. Remove:
• Crankshaft end cover "1"
• Timing mark accessing bolt "2"
1
3. Measure:
• Valve clearance
Out of specification → Adjust.
Valve clearance (cold)
Intake
0.06–0.12 mm (0.0024–0.0047 in)
Exhaust
0.20–0.26 mm (0.0079–0.0102 in)
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.
TIP
When the piston is at TDC on the compression
stroke, align the "I" mark "c" on the camshaft
sprocket with the match mark "d" on the cylinder
head.
2
b
a
3-6
PERIODIC MAINTENANCE
d
c. Measure the valve clearance with a thick-
ness gauge "1".
Out of specification → Adjust.
4. Adjust:
• Valve clearance
a. Remove the collars "1".
1
b. Slide the rocker arms "2" toward the timing
chain, and then remove the valve pads
"3".
2
3
TIP
• Before removing the valve pads, cover the
crankcase opening with a clean rag to prevent
them from falling into the crankcase.
c
1
3