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• Engage the cam followers (Clutch Hub) with the cams (Sub Clutch Hub).
• To measure the effective stroke of clutch spring plate, set a dial gauge [A] against the raised
center [B] of the clutch spring plate.
• Move the clutch housing gear back and forth [C]. The difference between the highest and
lowest gauge readings is the amount of the effective stroke of clutch spring plate.
[D] Drive Shaft
After installing the clutch to the engine, measure and record the depth [B] shown in the
figure on page 21 and 22. The length from the clutch spring plate to the top surface of the
sub clutch hub, using a caliper or a depth gauge. Manage the depth [B] to adjust the
effective stroke after that, because the friction disks would be worn and the length [A]
(Total thickness of all clutch plates) would change. The decrease of the depth [B] from
the initial setting shows the increase of the effective stroke of clutch spring plate from the
value initially measured.
When decreasing the length [A], total thickness of clutch plates, use the optional spring
retainers (provided as optional production parts) to keep the preload of clutch springs
according to the table below. If you have clutch slip during acceleration use shorter
spring retainers by 1 mm to increase preload of clutch springs.
When decreasing the length [A], total thickness of clutch plates, use the optional shim
(provided as optional production part) to keep the position of clutch release lever
according to the table below.
The standard setting of the number of leaf springs is four. By decreasing the number of
the leaf springs the sub clutch hub operates easily and pushes the clutch operating plate
causing more slip. Two types of nuts are available for the number of leaf springs, two and
three. They are provided as optional production parts. The number of leaf springs affects
all over the operation of the back-torque limiter but especially the beginning of the
operation.
Standard Selection of Spring Retainers
Total Thickness of Clutch Plates Size of Spring Retainers Remarks
40.2 ~ 40.7 mm 6 mm
P/No. 13091-1041
Original Setting
39.5 ~ 40.2 mm 5 mm P/No. 39108-0004
* If clutch slip is occurred with a retainer of 6 mm, try with a retainer of 5 mm.
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