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1.
Castle Nut at Pivot Bar
2.
Bend in Tie Rod
3.
Lock Nut "D"
4.
Lock Nut "C"
■^NOTE
Carburetor adjustments should be made with
the air cleaner on engine.
CARBURETOR ADJUSTMENTS (See Figure 27)
A
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 and be careful of heated
surfaces and muffler.
WARNING
To avoid injury or an accident, be sure the
brake pedal is in the locked position, transmis¬
sion is in neutral, and any equipment is disen¬
gaged before starting engine to make car¬
buretor adjustments.
WARNING
Carbon monoxide fumes can be fatal! Do not
make any adjustments to the carburetor in a
confined area such as a storage building.
Move the tractor outside into the air.
INITIAL ADJUSTMENT — Turn idle and needle valves
clockwise until they close (see Figure 27).
A CAUTION
Valves may be damaged by turning them too
far.
Now open high speed needle valve 1-1/2 turns coun¬
terclockwise and idle valve 1-1/4 turns. This initial
adjustment will permit the engine to be started and
warmed up prior to final adjustment.
FINAL ADJUSTMENT PROCEDURE
Idle Valve Mixture
Place throttle control lever in "SLOW" position. Set
idle speed adjusting screw to obtain 1750 R.P.M. mini¬
mum while holding throttle lever against screw. Turn
idle valve in until R.P.M. slows or misses (clockwise —
lean mixture), then turn it out past smooth idling point
until engine runs unevenly (rich mixture). Now turn idle
valve to the midpoint between rich and lean so the
engine runs smoothly. Release throttle lever.
GOVERNED IDLE
Turn idle speed adjusting screw to obtain 1600 R.P.M.
while holding throttle lever against screw. Release
throttle lever. Align holes in control bracket and inside
lever with 1/8 inch diameter rod. Throttle control lever
should be in "SLOW" position. Adjust if necessary.
Bend spring tang to obtain 1750 R.P.M. Remove 1/8
inch diameter rod (see Figure 28).
Figure 28. Governed Idle Adjustment
18
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