Yamaha LB50IIAC - Check Lever Position for Travelling; Checking

4. When the engine is stopped
The pressure in the rubber pipe
becomes positive, and the diaphragm
assembly is moved to the left by the
force
of the spring. As a result, the
valve is closed,
thus stopping the flow of
the fuel.
Check lever position for travelling
1. On position
For general travelling and parking, the
cock lever should be placed in ON.
2.
RES position
When the fuel has run out with the cock
lever in ON,
it should be placed in RES.
With the fuel cock in RES, the tank
should be filled at the first opportunity.
3. PRI position
To fill the fuel tank of a new motorcycle
or one in which the fuel tank or car-
buretor float chamber is empty, turn the
cock lever to PR I. With the cock lever in
PRI.
the fuel directly enters the filter cup
from the fuel tank, bypassing the rubber
pipe.
After filling the tank, turn the cock lever
to ON.
Checking
Remove the filter cup, set the auto-cock lever
in
ON or RES, and kick the kick pedal. When
gasoline begins to flow out. stop kicking.
If gas continues flowing, the auto-cock is in
bad
condition.
1. Gasoline flows out when pedal is not
kicked.
a. The valve 0-ring or the valve seat is
damaged.
- 124 - 1 Filter cup