MTD 110-072A - Manual (Page 7)

Low Position
High Position
FIGURE/.
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. See
figure 8.
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.
WARNING t
FIGURE 8.
If any adjustments are made to the
engine while the engine is running
(e.g. carburetor), disengage all clut­
ches and blades. Keep clear of all
moving parts and be careful of
heated surfaces and muffler.
CARBURETOR ADJUSTMENTS (See figure 9.)
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:
1. Start engine and run long enough to warm it to
operating temperature. If engine is out of ad­
justment so that it will not start, close the nee­
dle valve by turning it clockwise. Then open
needle valve
I V
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
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.
3. Move engine control to “SLOW”.Turn idle ad­
justing screw until a fast idle is
obtained—(1750 R.P.M.).
4. To check adjustment move engine control
from “SLOW” to “FAST” speed. Engine
should accelerate smoothly. If engine tends
to stall or die out, increase idle speed or re­
adjust carburetor, usually to a slightly richer
mixture.