Specifications

MAINTENANCE
43
550 Gas/LPG 330650 (2--05)
CARBURETOR
The carburetor has three basic adjustments. They
are idle fuel mixture, fixed high speed jet, and idle
speed adjustment.
The idle fuel-air adjusting needle controls the idle
mixture. Turning the idle adjusting needle
clockwise results in a leaner mixture. Turning the
idle adjusting needle counterclockwise results in a
richer mixture.
The high speed jet is not adjustable. For high
altitude it may be exchanged for reduction in size
to lean the fuel to compensate for the lighter, thin
air. The size must be carefully determined first by
testing a smaller jet with 0.001 to 0.002 in (0.025
to 0.050 mm) smaller passage, depending on the
elevation.
A
B
00052
CARBURETOR ADJUSTMENTS
A. Idle Mixture Adjustment Needle
B. Idle Speed Adjustment
The idle speed is adjusted by turning the screw
clockwise to increase speed or counterclockwise
to lower the speed.
W ARNING: Engine Emits Toxic Gases.
Severe Respiratory Damage Or
Asphyxiation Can Result. Provide
Adequate Ventilation. Consult With Your
Regulatory Agency For Exposure
Limits. Keep Engine Properly Tuned.
FUEL SYSTEM -- GASOLINE -- GM ENGINES
(For machines serial number 006409 and
above)
FUEL FILTER (For machines serial number
006409 -- 007005)
The fuel filter is located under the fuel tank. Clean
the fuel filter as required. Replace the filter after
every 400 hours.
IN--LINE FUEL FILTER
The in--line fuel filter is located on the end of the
fuel pump, between the fuel pump and the fuel
line. (For machines serial number
006409--007005) Replace the fuel filter every 200
hours of operation. (For machines serial number
007006-- ) Replace the fuel filter every 800
hours of operation.
ELECTRONIC FUEL INJECTION -- GM
ENGINES
The electronic fuel injection system requires no
adjustment.
The fuel injected system is equipped with a
“manifold absolute pressure sensor” (MAP
Sensor). The MAP sensor senses barometric
pressure and automatically corrects the fuel
system calibration for changes in altitude. This
means the air/fuel mixture will always be
optimized, regardless of elevation (or barometric
pressure), however, the engine will still lose 3.5%
power for every 1000 ft increase in elevation.
A
ELECTRONIC FUEL INJECTION
W ARNING: Engine Emits Toxic Gases. Severe
Respiratory Damage Or Asphyxiation Can
Result. Provide Adequate Ventilation. Consult
With Your Regulatory Agency For Exposure
Limits. Keep Engine Properly Tuned.
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