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The clutch on all Bridgestone rotary disc models is a multiple disc type, running in oil. The clutch is
mounted on the transmission countershaft. Clutch friction (fiber) plates are fitted inside the clutch housing
with six teeth so that they turn with the clutch housing and driven gear. Clutch friction plates and inner
plates are fitted alternately (steel plate first, then fibre plate, etc.) with the inner (steel) plates fitted to the
clutch hub with teeth.
50, 60 Spt. Clutch Friction Plate .. 3
Inner Plate .......... 3
Clutch Springs ....... 6
Fitting Tension ...... 110 inch lbs.
90 cc. Clutch Friction Plate .. 5
Inner Plate .......... 5
Clutch Springs ....... 6
Fitting Tension ...... 120 inch lbs.
175 DT Clutch Friction Plate .. 6
Inner Plate .......... 5
Clutch Springs ....... 6
Fitting Tension ...... 130 inch lbs.
B. Operation:
Located between the engine and transmission, the clutch transmits or cuts off engine power to the
transmission and rear wheel.
Engine power is transmitted from the pinion gear on the crankshaft through the driven gear on the clutch
housing. The clutch hub, friction plates and inner plates all fit inside the clutch housing. When pressed
together by the clutch springs, the plates come into solid contact and rotate as a unit. The clutch hub is
spline fitted to the transmission countershaft, which turns the transmission gears.
When the clutch lever is pulled, the clutch wire turns the clutch release arm so that the adjusting screw
pushes the roller and depresses the clutch set (thrust) plate ball. The clutch springs are then compressed so
that they do not press the clutch friction plates against the inner plates. As the friction plates and inner
plates separate, the inner plates cease to turn so that engine power is cut off from the clutch hub and
transmission countershaft.
In addition to transmitting engine power, the clutch has a large affect on riding comfort, so smooth
operation of the clutch is necessary for comfortable riding.
If the clutch drags, gear shift operation becomes faulty and gears or the gear change arm can be damaged.
If clutch slips, poor acceleration, engine overheating, loss of engine power and uncomfortable riding will
result.
C. Adjustment:
Correct clutch operation requires proper setting of both the clutch cable adjuster and the clutch adjusting
screw which acts upon the clutch throw-out bearing.
Clutch cable adjustment should not be attempted without first removing the carburetor cover on the right
side of the engine assembly. The cable adjustment determines the position of the clutch release arm and it
is essential that the release arm is properly positioned to assure smooth clutch operation.
To adjust clutch:
1. Remove carburetor cover.
2. Turn cable adjuster until the release arm is positioned so that the center-to-center distance between the
release arm pivot pin and the spring pin is 1 ¼" as shown in Fig. 65. (Screw cable adjuster in to shorten
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