A qualied technician can improve high altitude performance with certain
modications. Have your carburetor modied if the engine will routinely
be operated at altitudes above 5,000 ft (1,524 m). Even with carburetor
modication, engine power will decrease about 3.5% for each 1,000 ft (305
m) increase in altitude. The eect of altitude on engine power will be greater
than this is if no modication is made.
NOTICE! When the carburetor has been modied for high altitude
operation, the air fuel mixture will be too lean for low altitude use.
Operation at altitudes below 5,000 ft (1,524 m) may cause the engine to
overheat and result in serious engine damage. When using this engine
at low altitudes, have a qualied technician return the carburetor to
original factory specications.
CLEANING THE SEDIMENT CUP
CAUTION! Wear latex or rubber gloves when working on the sediment
cup. The cup may contain fuel that will cause skin irritation. Prolonged
and repeated exposure to fuel on skin may result in dry, cracked skin.
1. Switch the fuel valve to the OFF position.
2. Remove the fuel sediment cup, screw and o-ring.
3. Clean the sediment cup with a non-ammable solvent or
detergent and rinse. Allow to dry. Some chemicals will
damage the o-ring material. Check for compatibility or replace
the o-ring.
4. Reassemble the sediment cup and o-ring.
5. Switch the fuel valve to the ON position and check for leaks.
Replace the o-ring if the installation is correct, but fuel still
leaks from the cup.
ADJUSTING THE ENGINE IDLE SETTING
NOTICE! The engine speed is set by the factory. Increasing the speed
too much can damage the engine. Too low a speed will reduce the
engine’s eciency. Have a qualied technician adjust the engine speed if
necessary.
The engine’s idling speed is adjustable by turning the governor arm screw to
lower or increase the engine output (RPMs).
FIGURE 5.
8315517 OHV GAS ENGINE WITH ELECTRIC START V1.1
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