Evolution Engines 91NX - Manual (Page 3)

EN
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• Always ensure the throttle failsafe is set to low throttle in your transmitter.
• Always perform a range check prior to flight.
• Always cut off the fuel supply (pinch or disconnect the fuel line to the carburetor) or use
the throttle linkage to shut off the air in order to stop the engine.
• Never use hands, fingers, or any other body part to stop the propeller.
• Never throw any object into a propeller to stop it.
• Never run the engine in the vicinity of loose small objects, such as gravel or sand, to avoid
the propeller uncontrollably throwing such materials.
• Never wear loose clothing or a loose neckstrap when operating your model engine as these
items could become entangled in the propeller.
• Never have loose objects such as screwdrivers, pencils, etc. in your pockets when operating
your model engine. These could fall into the propeller.
• Never allow fuel to come into contact with eyes or mouth. Gasoline and other fuels used
in model engines are poisonous.
• Always ensure gasoline and fuel are stored in a clearly marked container away from
the reach of children.
Precautionary Guidelines
• Always mount the engine securely on a bench mount or high-quality engine mount.
• Always use the correct size and pitch of propeller for your engine. Refer to the Propeller Chart
in this manual.
• Always confirm proper balance of your propeller prior to installation of the engine. Failure
to do so could result in damage to the engine and/or airframe.
• Always utilize an electric starter to start your engine.
• Always discard any propeller that is nicked, scratched, cracked or damaged in any way.
• Always run your model engine in a well-ventilated area. Model engines can produce possibly
harmful carbon monoxide fumes.
• Always store your fuel safely in a sealed, water-resistant container.
• Always store fuel in a cool, dry location. Do not allow fuel containers to come in direct
contact with concrete, as the fuel may absorb moisture.
• Always responsibly discard fuel if there is condensation and/or water inside the fuel
container.
• Never return unused fuel from the fuel tank back into the fuel container.
• Never attempt to repair or modify a propeller beyond its intended use.
• Never handle model engines, mufflers and/or tuned pipes until they have had time to cool.
They can become extremely hot when in use.
Introduction
Congratulations on your purchase of the newest and one of the most technically advanced
2-stroke model airplane engines in the world. Whether you are new to the sport of model
aviation or are an experienced flier, you will enjoy the features of the new Evolution
® .91 Engine.
The Evolution .91 engine is designed to be the most powerful in its class, extremely easy to
start and operate, and provide years of enjoyable service. It incorporates many unique design
features, such as our SetRight
™ needle valve assemblies. We’ve incorporated an angled needle
valve to keep your fingers further from the propeller, and a new ringed piston, dual crankshaft
ball bearing and keyed prop driver. Every feature is designed to ensure success with your new
engine. The Evolution .91 fits a standard .61-sized engine mount and after-market mufflers, mak-
ing it easy to squeeze more power into your .61-sized airframe.
This user guide is intended to provide the basic information needed to operate and maintain
your Evolution .91 Engine. Every Evolution engine has been baseline adjusted at the factory and
is ready to fly.
While this Evolution engine is extremely easy to operate, if this is your first experience flying a
model airplane, it is highly recommended that you have the help of an experienced modeler
during the first few flights. Your local hobby store or flying club can put you in touch with an
experienced pilot in your area.