Suzuki EN125-2A, Service Manual

Page: 19 / 208

PERIODIC MAINTENANCE AND TUNE-UP PROCEDURES 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.
Remove the tachometer cable.
Remove the left cap of the cylinder head cover.
Remove spark plug, valve inspection caps ,
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 "l line on the rotor is
aligned with the center of hole on the crankcase.)
Insert the thickness gauge to the valve stem
end and the adjusting screw on the rocker arm.
Remove the right cap of the cylinder head cover.
"
NOTE:
Valve clearance is 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.
VALVE CLEARANCE
Inspect initial 1 000 km and Every 4 000 km
Thickness gauge
09900-20803
Valve clearance specifications
IN.
EX.
0.04 0.07 mm
0.13 0.18 mm
-
-
If clearance is off the specification, bring it into
the specified range by using the special tool.
Tappet adjust driver
09917-13210
Reinstall spark plug, valve inspection caps,
cylinder hand cover caps, tachometer cable, valve
timing inspection plug and magneto cover cap.
1
1
2
3