1-3 GENERAL INFORMATION
3. CLUTCH MISSION
The Primary Gear Ratio is improved from 3.47 to 3.50 in order to increase rotation.
For improving CLUTCH durability while long distance driving, CLUTCH DAMPER is changed from rubber to steel Spring type.
4. VALVE TRAIN
The maximum power appears at 8500rpm, so that TORQUE is good enough to have a long distance driving or downtown driv-
ing.
The valve angle is 25�(IN) and 28�(EX) which are much narrower agles for ROCKER ARM 4 VALVE and TORQUE(1.02㎏∙m)
is achieved by improving VOLUME EFFICIENCY.
The technical design is done through the enough simulation by the design SOFTWARE which our company have kept, in order
to not making trouble like JUMPING or SURGING.
5. CAM SHAFT, LOCK ARM and VALVE
The material of CAM is CHILLED FC, whose durability and safty is high.
For improving acceleration, the inside of Cam Shaft is designed empty.
For improving durability, BALL BEARING TYPE for
CAM SHAFT is adopted and LOCK ARM is sur-
faced with HARD CROME COATING and LUBRITE.
For preventing the touching noise, the contacted
SPRING CAM is adopted.
The Valve (IN 22, EX 19) is surfaced with
TUFTLITE.
The left side of VALVE and TAPPET are surfaced
with STELLITE, especially the surface hardness is
over HRC50 by surfacing STELLITE NO 1, so
thatTAPPET's durability is improved by preventing
wearing.
25�
IN.
ф22
ф19
EX.
28�
Summary of Contents for GF125
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