Serial Number Locations; Fuel And Oil Recommendations; Break-In Procedure - HYOSUNG GF125 Service Manual

1-1 GENERAL INFORMA TION

SERIAL NUMBER LOCATIONS

The frame serial number ① is stamped on the rear end
of the frame. The engine serial number ② is located on
the crankcase.
These numbers are required especially for registering the
machine and ordering spare parts.
FUEL AND OIL
RECOMMENDATIONS
FUEL
Gasoline used should be graded 85-95 octane or higher.
An unleaded or low-lead gasoline type is recommended.
NOTE:
Unleaded and low-lead gasoline will extend spark
plug life.
①
②
ENGINE OIL
Be sure that the engine-oil you use comes under API
classification of SF or SG and that its vicosity rating is
SAE 10W-40. If SAE 10w-40 motor oil is not avaliable,
select the oil viscosity according to the following chart.
SAE
40
30
20W/50
10W/50
10W/30
20W
10W
-20
Temp.
-4
FRONT-FORK OIL
TELLUS #22

BREAK-IN PROCEDURE

During manufacture only the best possible materials are
used all machined parts are finished to a very high stan-
dard but it is still necessary to allow the moving parts to
"BREAK-IN" before subjecting the engine to maximum
stresses. The future performance and reliability of the
engine depends on the care and restraint exercised during
its early life. The general rules are as follows:
Initial 800km
Up to 1,600km
Over 1,600km
● Keep to these break-in engine speed limits:
● Upon reaching an odometer reading of 1,600km you
can subject the motorcycle to full throttle operation.
However, do not exceed 10,500r/min at any time.
● Do not maintain constant engine speed for an extend-
ed time period during any portion of the break-in. Try
to vary the throttle position.
-10 0 10 20 30 40
14 32 50 68 86 104
Below 4,500r/min
Below 5,500r/min
Below 10,500r/min