Yamaha LB50IIAC - Page 7

2. The use of an automatic 2-speed centrifugal clutch relieves the rider from the cumbersome
operation of the shift lever. That is, ease of operation and additional safety are ensured for
the rider. When starting out, gears are automatically shifted into first, and then into second
according
to engine load. This will result in a longer life of the engine.
Automatic transmission mechanism
The automatic transmission mechanism consists of two shoe-type centrifugal clutches.
1st gear clutch: -, FGr starting out and for 1st gear operation.
2nd gear clutch: -, For automatic change to 2nd gear.
1. Each clutch has three clutch shoes
operated
by centrifugal force. These
shoes are
well balanced to minimize the
vibration for smooth operation.
This clutch is provided with linings of
high wear-resistance. and thus excellent
clutching power is guaranteed. The
heat generated by friction between
shoes and lining is quickly dissipated
through the gear oil to the clutch hous-
ing,
with which the clutch shoes are in
contact.
2. The 2nd gear side is provided with an
overrunning clutch.
3.
An overrunning clutch for starting is
built in the hub of driven gear 1. Longer
life is ensured
by simple construction.
1st clutch
2nd clutch
1st driven gear
-2-