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its normal position, the lock nut on top of the carburetor at the point through
which needle passes should first be loosened, as otherwise it is impossible to
tell when the needle is turned down in its seat too far. Turning the needle down
to tightly will result in its becoming grooved and the seat enlarged. When these
parts are damaged it is difficult to maintain proper adjustment of the carburetor.
Having determined the point where the motor runs at its maximum speed, the needle
valve lock nut should be tightened to prevent the adjustment being disturbed.For
average running, a lean mixture will give better results than a rich one.
Why does water
clog the Carburetor? Answer No. 46
The presence of water in the carburetor or gasoline tank, even in small amounts,
will prevent easy starting and the motor will misfire and stop. As water is
heavier than gasoline it settles to the bottom of the tank and into the sediment
bulb along with other foreign matter. As it is difficult nowadays to get gasoline
absolutely free from impurities, especially water, it is advisable to frequently
drain the sediment bulb under the gasoline tank. During cold weather the water
which accumulates in the sediment bulb is likely to freeze and prevent the
flow of gasoline through the pipe leading to the carburetor. Should anything
of this kind happen it is possible to open the gasoline line by wrapping a
cloth around the sediment bulb and keeping it satuated with hot water for a
short time. Then the water should be drained off. In event the water gets down
into the carburetor and freezes, the same treatment may be applied.
able to remove this pipe in the hot season —but it is an absolutely necessary
feature during cold weather.
What is the purpose
of the Float? Answer No. 51
It automatically controls the flow of the gasoline into the carburetor. If
it floats too low, starting will be difficult; if too high, the carburetor
will flood and leak. A cork float which has become fuel soaked should be removed
and replaced by a new one or thoroughly dried and then given a couple of coats
of liquid shellac to make it waterproof.
Should Priming Rod be used in starting when Motor is warm?
No. The carburetor does not ordinarily require priming when the motor is warm,
and starting with the rod pulled out is apt to "flood" the engine
with an over-rich mixture of gas, which does not readily explode. This naturally
causes difficulty in starting. If you should accidentally flood the engine,
turn the carburetor adjusting needle down (to the right) until it seats; then
turn the engine over a few times in order to exhaust the rich gas. As soon
as the motor starts, turn back the needle (to the left) and readjust the carburetor.
Answer No. 52
What makes the Carburetor leak?
Answer No. 47
The flow of gasoline entering the carburetor through the feed pipe is automatically
regulated by the float needle raising and lowering in its seat. Should any
particle of dirt become lodged in the seat, which prevents the needle from
closing, the gasoline will overflow in the bowl of the carburetor and leak
out upon the ground.
When there is dirt
in the Carburetor—what? Answer No. 48
The spraying nozzle of the carburetor having a very small opening, a minute
particle of grit or other foreign matter will clog up the orifice, and result
:motor will begin to misfire and slow down as soon as it has attained any considerable
speed. This is accounted for by the fact that at high speeds the increased
suction will draw the particles of dust, etc., into the nozzle. By opening
the needle valve half a turn and giving the throttle lever two or three quick
pulls the dirt or sediment will often be drawn through, when the needle may
be turned back to its original place. If this does not accomplish the purpose,
the carburetor should be drained.
If Engine runs too fast or chokes with throttle retarded —what?
Answer No. 49
If the engine runs too fast with the throttle fully retarded unscrew the carburetor
throttle lever adjusting screw until the engine idles at suitable speed. If
the motor chokes and stops when throttle is fully retarded the adjusting screw
should be screwed in until it strikes the boss, preventing the throttle from
closing too far. When proper adjustment has been made, tighten lock-screw so
that adjusmtent will not be disturbed.
What is the purpose of the Hot Air Pipe?
Answer No. 50
It takes the hot air from around the exhaust pipe and conducts it to the carburetor—where
the heat facilitates the vaporizing of the gasoline. It is usually advis-