Bolens 120-337A - Manual (Page 11)

FIGURE 21.
THROTTLE
If adjustment becomes necessary, the throttle
control wire assembly can be reset as follows:
1. Loosen, but do not remove, the screw secur­
ing throttle control wire assembly at engine.
See figure 22.
2. Move throttle control lever on handle to
“FAST” position.
3. Move lever to which control wire is fastened
at engine to full open position. Retighten
screw to secure throttle control wire
assembly.
FIGURE 22.
HANDLE POSITION
The upper handle can be adjusted to a high or low
position. The operator of the lawn mower can easi­
ly adjust the handle position by unscrewing the
two knobs, removing the two bolts and reassem­
bling in the other position. No tools are necessary
to make this adjustment. See figure 23.
FIGURE 23.
I WARNING
\
If any adjustments are made to the
engine while the engine is running
(e.g. carburetor), disengage all
clutches and blades. Keep clear of
all moving parts. Be careful of
heated surfaces and muffler.
CARBURETOR ADJUSTMENTS (See figure 24)
Minor carburetor adjustments may be required to
compensate for differences in fuel, temperature,
altitude and load.
All carburetor adjustments should be made with
the air cleaner on engine. Air cleaner mounting
screw must be in carburetor when engine is run.
Best adjustment is made with a fuel tank half full
of gasoline.
To Adjust Carburetor:
1. Start engine and run long enough to warm it to
operating temperature.
If engine is out of adjustment so that it will
not start, close the needle valve by turning it
clockwise. Then open needle valve 1-1/2 turns
counterclockwise.
2. Move engine control to run engine at normal
operating speed.
a. Turn needle valve in clockwise until
engine starts to lose speed (lean mixture).
b. Then slowly turn needle valve out counter­
clockwise past the point of smoothest
operation until engine just begins to run
unevenly (rich mixture).
c. Turn needle valve back in clockwise very
slowly till engine runs evenly.
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