Powermate PMi 2000, User Manual

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authorized agent to modify the carburetor.
Even though you use the proper nozzle, the horsepower of the engine will still
decline 3.5% as the altitude increases every 300meters (1000 feets). If these
adjustments are not made, the altitude will have greater influence on power.
Look out
The nozzle of the engine is designed for high-altitude areas. If it is put to use in
low altitudes, the outputting power may decline and become too hot, and even
the engine will be damaged seriously because the ratio of the air and burning
gasoline is too low.