Bolens 112-170-300 - Manual (Page 8)

FIGURE 13.
CUTTING HEIGHT
An adjusting plate and thumb lever at each wheel
position provides cutting height adjustment. Each
adjusting plate has five holes. Height of cut will
be changed when the thumb lever is moved from
one hole to another. Simply depress thumb lever
towards
wheel and move wheel and lever
assembly to desired position. All wheels must be
placed in the same relative position.
HANDLE POSITION
The upper handle can be adjusted to a high or low
position. The adjustment is made by removing the
two knobs or hex nuts and lock washers, removing
the two curved carriage bolts and reassembling in
the other position. See figure 14.
THROTTLE
If adjustment becomes necessary, the throttle
control wire assembly can be reset as follows:
1. Loosen, but do not remove, screw securing
throttle control wire assembly at engine.
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 and retighten
screw to secure throttle control wire
assembly.
(D
i WARNING i
FIGURE 14.
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 ADJUSTMENT (See Figure 15)
Minor carburetor adjustment 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, proceed as
follows.
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 1V2 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
counterclockwise 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.
d. Final adjustment of the needle valve
should be slightly to the rich side (turn
counterclockwise) of the mid-point.