Valve Clearance; Compression Prossure - HYOSUNG GF125 Service Manual

VALVE CLEARANCE

Inspect Initial 1,000km and Every 5,000km
Excessive valve clearance results in valve noise and insuf-
ficient 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 fol-
lows:
● Remove spark plug, cylinder head cover ①, and valve
timing inspection plug ②.
● Remove the magneto cover cap ③ and rotate the mag-
neto rotor with the 14mm 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 hole on the crankcase.)
● Insert the thickness gauge to the valve stem end and
the adjusting screw on the rocker arm.
09900-20803
Valve clerance specifications
IN. and EX.
● If clearance is off the specification, bring it into the
specified range by using the special tool.
09917-14910
● Reinstall spark plug, cylinder head cover, valve timing
inspection plug and magneto cover cap.
NOTE:
Valve clearance is to 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.
COMPRESSION PRESSURE
Inspect Initial 1,000km and Every 5,000km
Refer to page 3-1
PERIODIC MAINTENANCE AND TUNE-UP PROCEDURES 2-6
Thickness gauge
0.10-0.13mm
Valve adjust driver
①
②
③