Engine; Adjusting The Valve Clearance - Yamaha XC50V Service Manual

ADJUSTING THE VALVE CLEARANCE

2
b
a
EAS00049

ENGINE

ADJUSTING THE VALVE CLEARANCE
The following procedure applies to all of the
valves.
NOTE:
8 Valve clearance adjustment should be made
on a cold engine, at room temperature.
8 When the valve clearance is to be measured
or adjusted, the piston must be at top dead
center (TDC) on the compression stroke.
1. Remove:
8 seat/trunk
8 battery cover
8 battery holder
8 front cover
Refer to "COVER AND PANEL".
2. Drain:
8 coolant
(completely from the radiator )
3. Remove:
8 radiator cover 1
8 radiator
8 fan case2
Refer to "RADIATOR"in chapter 6.
4. Remove:
8 spark plug cap
8 spark plug
8 ignition coil
1
8 cylinder head cover
5. Measure:
8 valve clearance
Out of specification
Valve clearance (cold)
Intake valve
0.10 ~ 0.16 mm (0.004 ~ 0.006 in)
Exhaust valve
0.18 ~ 0.24 mm (0.007 ~ 0.010 in)
*****************************************************
a. Turn the crankshaft counterclockwise.
b. When the piston is at TDC on the compres-
sion stroke, align the punch mark a in the
camshaft sprocket with the stationary b on
the plate.
c. Align the TDC mark c on the AC magneto
rotor with the stationary pointer d on the
crankcase cover.
3-9
CHK
ADJ
Adjust.