General Informa Tion; Special Features - HYOSUNG GF125 Service Manual

GENERAL INFORMA TION 1-2

SPECIAL FEATURES

HYOSUNG GF 125 is a improved model that has been revised from 2 valve evgine of GF 125 to 4 valve engine and has
much more developed features as follows.
1. IMPROVEMENT OF ENGINE POWER AT MIDDLE AND LOW SPEEDS
In order to make long distance driving more comfortable and easier which is the best point of American Style, the VALVE
TIMING, multi-valve from 2 valve to 4 valve and the proper design of narrower angle VALVE port are done without losing
TORQUE at high speeds.
2. LESS VIBRATION AND NOISE
In order to meet customer's demands for less vibration, the VIBRATION with the body is prevented by making the engine
strength higher and natural frequency high order AND the previous SYSTEM which prevents vibration transmissibility is get
together.
For less noise, the INTAKE & EXHAUST system and VALVE TRAIN system are redesigned in order to satisfy 71 db, the strict
'96 KOREA NOISE REGULATION.
3. COMFORTABLE SEATING
The seat is made out of two different hardness FOAM URETHANE in order to absorb shock which makes seating more com-
fortable.
THE TECHINICAL FEATURES
1. CYLINDER HEAD
The best conbustion efficiency is done by the 4 VALVE seat system's connecting TWO IN ONE HOLE INTAKE AND EXHAUST to
SPARK PLUG in Pentroof combustion chamber casted at the low pressure.
The silent chain is more closely united and the cylinder head wall is thickened more for decreasing chain noise.
By choosing ALUMINUM forging, HOLDER gets lighter and stronger.
2. PISTON, CONNECTING ROD and CAM CHAIN
PISTON, high tension HI-SILICON, AC8A, is FLAT type, HEAD, and T-type, SHORT SKIRT which is Φ57, suitble for high speeds
and lightened for less vibration.
The part of CONNECTING ROD's small hole is Φ15, the PIN SIZE of large hole is Φ28 for enduring high engine power and
PITCH is 99.8.
CAM CHAIN is LINK PITCH 6.350(1/4")'s endless type and gets TIMMING and less noise by adopting Borg warmer 92RH.