Yamaha Scorpio Service Manual page 46

VALVE CLEARANCE ADJUSTMENT
3 - 4
ENGINE
VALVE CLEARANCE ADJUSTMENT
NOTE:
Valve clearance adjustment should be made
with the engine cool, at room temperature.
When the valve clearance is to be measured
or adjusted, the piston must be at Top Dead
Center (T.D.C) on the compression stroke.
1.Remove:
Air scoop (left and right) 1
G
2.Remove:
Spark plug
G
Tappet cover (intake side) 1
G
Tappet cover (exhaust side) 2
G
3.Remove:
Timing mark accessing screw (with O-ring) 1
G
Camshaft end cover (with O-ring) 2
G
4.Measure:
Valve clearance
G
Out of specification → Adjust.
Valve clearance (cold):
Intake valve 0.05 ~ 0.10 mm
Exhaust valve 0.10 ~ 0.15 mm
*****************************************************
Measurement steps:
G
Rotate the crankshaft counterclockwise to
align the slit a on the rotor with the slit b on
the crankcase cover when the piston is Top
Dead Center (TDC).
INSP
ADJ