21
Stopping the Engine
In emergency, push the engine switch to “OFF” to stall the engine; to stop it in normal, do so as follows:
1.)
Push the throttle lever to the right.
2.)
Turn the engine switch to the “OFF” position.
3.)
Turn the fuel valve to the “OFF” position.
High Altitude Operation
At high altitude, the standard carburetor air-fuel mixture will be
excessively rich. Performance will decrease, and fuel consumption
will increase.
High altitude performance can be improved by installing a smaller
diameter main fuel jet in the carburetor and re-adjusting the pilot
screw. If you always operate the engine at altitudes high than 6,000
feet above sea level, have your Powerhorse dealer perform these
carburetor modifications.
Even with suitable carburetor jetting, engine horsepower will
decrease approximately 3.5% for each 1,000 foot increase in
altitude. The effect of altitude on horsepower will be greater than this
if no carburetor modifications are made.
Exhaust Control System
While the engine is running, carbon monoxide, oxide of nitrogen and hydrocarbon will produce, and in certain
conditions, oxide of nitrogen and hydrocarbon will react with each other chemically and create a toxic carbon
monoxide.
1.
Maintenance
Maintain the engine periodically in accordance with the maintenance schedule. The maintenance schedule
has been created based on normal use and normal conditions. If using heavy load, operating in dusty and
wet conditions, or in extreme temperatures, service of the engine should be done more frequent.
2.
Replacement of Parts
It’s recommended that you should choose parts which are manufactured by Powerhorse. Using a lower
standards or an incompatible part may impair the exhaust control system.
CAUTION
Sudden stopping at high speed under heavy load is not recommended. Engine damage
may result.
CAUTION
Operation of the engine at an altitude lower than the carburetor is jetted for, may result in
reduced performance, overheating, and serious engine damage caused by excessively
lean air/fuel mixture.
