Evolution Engines 52NX User Manual

Evolution NX

Helicopter Engine

USER GUIDE

®

Introduction

Congratulations on your purchase of the newest
and one of the most technically advanced 2-stroke
helicopter engines in the world. Whether you are new
to the sport of model aviation or an experienced flyer,
you will enjoy the features of the new Evolution®
Engine’s NX Series Helicopter Engine.

The Evolution NX Helicopter 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 assembly. Every feature
is designed to ensure success with your new engine.

High Speed Needle

The Evolution NX Helicopter Engine features a
piston/liner made of a unique combination of ABC
(Aluminum piston, Brass, Chromed liner) type
construction with the addition of a ring to ensure
a great seal no matter the operating temperature.

Important: While the Evolution Helicopter Engine
is extremely easy to operate, if this is your first
experience flying a model helicopter, it is highly
recommended that you have the help of an
experienced modeler during the first few flights.
Your local hobby shop or flying club can put you
in touch with an experienced pilot in your area.

Glow Plug

Fuel Nipple

Glow Plug

Low-Speed Needle

Throttle Arm

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Features

1. Fits common and popular helicopters on
the market

2. Excellent operating and power characteristics

Installing the Muffler

The muffler must be mounted after the helicopter
engine has been installed in the helicopter. Refer to
the installation of the tank and engine in the helicopter
manual for the proper sequence of installation steps.

3. Offers new technology to the helicopter market

Break-in

It is not necessary to mount this engine on a test
stand for break-in. However, the engine should be
adjusted slightly on the rich setting for the first few
flights to insure proper break-in. Always use a good
quality fuel which contains 15-30% nitro methane
and an oil content of 20-23% low viscosity oil.

Mounting the Engine

Important: Be sure the lock washers for the muffler

mounting screws are placed over the screws. Securely
tighten both screws with moderate torque. It would be
wise to check the muffler mounting screws after each
run and prior to each flight as a part of your pre-flight
check of the helicopter.

Notes on Installation of Fuel Tank

1. The fuel lines should be connected to the fuel
tank as shown in the helicopter manual. Some
helicopters will use a “header” or holding tank
to help prevent foaming and provide for a more
stable motor run.

2. Since the tank is exposed to high pressures, be
sure all connections are secure and there is no
leakage.

3. Engines are sensitive to dirt in the fuel, so we
recommend a fuel filter be used. There are many
brands of filters so the modeler has a wide choice.
Always use the filter between the carburetor and
the line that goes to the fuel tank.

4. Adjustment of the carburetor and linkage will be
discussed later. Be sure to refer to the instructions
provided in the helicopter kit.

Engine Mounted in Helicopter

Most model helicopter kits include an engine mount.
Please refer to the helicopter manual for mounting
instructions and guidelines. It is extremely important
that the engine be securely mounted to the helicopter
and that the engine is securely mounted to the engine
mount. Follow the instructions included with the
helicopter kit for mounting the engine.

Important: Before each flying session, check that all
engine mounting screws are securely tightened.

Fuel Line Installation

3

Throttle Linkage

Install the throttle linkage and servo as per the instructions in the helicopter kit manual. The following illustration
is used as an example for the typical installation of the throttle arm and servo setup. Please note that we have
included markings on the throttle arm side of the carb body and throttle barrel. These markings correspond to “full
open, mid throttle, and fully closed carburetor positions. These marks are included to make your installation and
setup of the throttle mechanism even easier.

Throttle arm/Servo Link

With low-throttle and mid-trim (idle position on transmitter), the throttle barrel should be open approximately 1mm,
giving a low rpm idle (see photo below). Adjust the length of the linkage until the throttle barrel is exactly 1mm open.
Check to be sure the servo is moving in the correct direction. Full throttle should open the throttle barrel fully, while
low throttle, low trim should completely close the throttle barrel. Reverse the servo throw if necessary. Refer to carb
body markings.

Idle, closed to 1mm open

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