PERIODIC MAINTENANCE
2-6
Excessive valve clearance results in valve noise and
insufficient valve clearance results in valve damage and
reduced power. At the distances indicated above, check
and adjust the clearance to the following specification.
The procedure for adjusting the valve clearance is as
follows :
Remove the seat and fuel tank.
VALVE CLEARANCE
Remove spark plug, cylinder head cover
, and
valve timing inspection plug
.
Remove the magneto cover cap
and rotate the
magneto rotor with the 14 mm box wrench to set the
piston at (TDC) of the compression stroke.
(Rotate the rotor until the T line on the rotor is
aligned with the center of inspection plug hole.)
Insert the thickness gauge to the valve stem end and
the adjusting screw on the rocker arm.
If clearance is off the specification, bring it into the spec-
ified range by using the special tool.
Reinstall spark plug, cylinder head cover, valve tim-
ing inspection plug and magneto cover cap.
Thickness gauge : 09900-20806
Tappet adjust driver : 09917-14910
0.08~0.13 mm
(0.0032
0.0051 in)
Valve clearance of IN. and EX.
Inspect Interval
Inspect lnitial 1,000 km and Every 4,000 km.
CAUTION
Valve clearance should be checked when the
engine is cold.
Both the intake and exhaust valves must be
checked and adjusted when the piston is at Top-
Dead-Center (TDC) of the compression stroke.
CAUTION
If you don t rotate the crankshaft about 10
times before measuring the valve clearance,
there is no meaning of valve clearance.
