Yamaha LB50IIAC - Page 8

Theory of operation
1. Idling
At idling, the 1st gear side clutch driven
by the crankshaft is
kept uncoupled by
spring force, because of the centrifugal
force exerted on
the weights.
2. Starting out with 1st gear
As the throttle grip is twisted open, the
engine speed increases, and the spring
force is
overcome by the centrifugal
force, and
the clutch shoes are forced
against
the clutch housing, causing fric-
tion. As
the friction increases, the tur-
ning force of the engine is transmitted
to the main axle through 1st drive and
driven gears.
3. Reduction and
2nd gear
As the throttle grip is further opened,
the
2nd side clutch begins to operate.
That is,
the clutch shoes are forced
against
the clutch housing by the
weights, and thus the engine power is
transmitted through 2nd drive and
driven gears
to the main axle.
At this stage, the 1st gear side clutch is
released because
it is an overrunning
clutch.
-3-
t. Clutch housing
2
1st dutch
3. 2nd clutch
4. 1st drive gear
5. 1st driven gear
1. Subtransmission
2. Rear wheel
G
CD
@
(j)
®
6. 2nd drive gear
7.
2nd driven gear
8. Main axle
9. One-way dutch
c-
1
_---1-1-----=-.l-l- c
CD
c1
1. Subtransmission
2. Rear wheel