Evolution Technologies 58GX2, 45GX2 User Manual

Evolution Engines

45GX2/58GX2

US ER G UI DE

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2

Introduction

Congratulations on your purchase of the newest and one of the most technically advanced 2-stroke gas model airplane 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®
GX engine.

Evolution engines are designed to be the most powerful in their class, extremely easy to start and operate, and provide years of
enjoyable service. These engines incorporate many unique features designed to ensure success with your new engine.

This user’s guide is intended to provide the basic information required to operate and maintain your Evolution GX engine.

Important: While the 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 shop or flying club can put
you in touch with an experienced pilot in your area.

Before using this engine, please read these instructions carefully.

Evolution® Engines 2-Year Warranty

This Evolution Engines product is guaranteed to be free from
defects in materials and workmanship for a period of 2 years
from the date of purchase by the original owner. This war­ranty is not transferable. Horizon Hobby reserves the right
to inspect any and all equipment involved in a warranty
claim. Repair or replacement decisions are also determined
by Horizon Hobby, Inc. Collateral damage of any type is not
covered under this warranty.

This warranty does not cover any component parts damaged
or changed by modification. In no case shall Horizon Hobby
or Evolution Engines liability exceed the original cost of
the engine.

This warranty does not apply to wear from normal use;
damage or defects resulting from misuse, neglect or abuse;
damage caused by customer disassembly, use of substan­dard fuel, use of incorrect accessories (spark plug, propeller,
etc.); or damage resulting from a crash, or any use of this
engine other than for which it is specifically intended. Any of
the above will automatically void the warranty of the engine.

In that Horizon Hobby has no control over the final installation
and use of this product, the materials used in installation,
or the product in which this engine is installed, no liability
shall be assumed nor accepted for any damage resulting in

the use of this product once it is installed. By the act of using
the installed product, the user accepts all resulting liability.
If the buyer is not prepared to accept the liability associated
with the installation and/or use of this product, the buyer is
advised to return the engine immediately in new and unused
condition to the place of purchase.

Should your engine require warranty or non-warranty repair
service, please package it carefully and return it to the
address below, along with a copy of the original invoice or
receipt and a detailed letter explaining the problems. Write
your name, address and daytime phone number clearly on
the letter and return it via FedEx, UPS or insured Parcel Post
(Evolution Engines will not be responsible for product lost
en route).

For repairs not covered under warranty, please specify in your
letter whether you want an estimate of the repair charges
prior to performing the service (which may cause a slight
delay). Payment for non-warranty repairs should be made
by credit card or money order. If you have any questions con­cerning this or other Evolution products please contact the
Horizon Product Support Team at 877-504-0233.

Evolution/Horizon Service Center

4105 Fieldstone Road, Champaign, IL 61822

877-504-0233

[e-mail]

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3

Mounting the Engine

Most model airplane designs make provision for an engine
mount. It is extremely important that the engine mount be
securely attached to the airplane’s firewall and that the engine
is securely attached to the engine mount. Follow the instructions
included with the airplane for mounting the engine. The engine
should be fastened in place with 4 screws. Use 1/4” or 6mm
screws. If you decided to fasten the engine using a flexible motor
mount, always choose parts with enough solidity and strength.
Make sure all screws are tightened and regularly check that they
remain tight and in good condition.

Important: Air is necessary to cool the engine during operation.
Make sure that sufficient air circulation through the cowling is
provided. As a basic reference, the outlet area should be 3–5 times
the area of the inlet area to provide adequate cooling.

Throttle Linkage

Carefully attach the throttle linkage to the engine using a ball
link on the carburetor. Make sure that the linkage is free to
operate from low throttle to high throttle and confirm that the low
throttle setting on the transmitter closes the carburetor butterfly
to the low idle position. Adjust the length of the pushrod until full
throttle opens the carburetor butterfly fully, while low throttle, low
trim completely closes the butterfly.

Attaching the Fuel Lines

Use medium gasoline-compatible fuel line in the fuel tank as
well as the supply line to the engine.

Fuel for the Evolution Gas Engine

The Evolution gas engine has been designed to run on a mixture
of high-quality unleaded gasoline and synthetic oil intended for
racing 2-stroke gasoline engines. For the break-in period of the
new engine, mix the fuel in a ratio of 30 parts gasoline to 1 part
lubricant. After break in, use a ratio of 40 parts gasoline to 1
part lubricant.

Selecting a Suitable Propeller

The Evolution 45GX and 58GX have been designed to generate
maximum power at 6100–6300 rpm, according to the type
of exhaust used. If you wish to utilize the maximum power
output, choose a propeller which will allow the engine to reach
these revolutions, or slightly lower revolutions (The engine will
unload in the air depending on the aircraft speed and propeller
selected).

We do not recommend using propellers that allow the engine to
reach more than 7500 rpm on the ground.

Suggested Propeller Dimensions

These engines (45GX2 and 58GX2) are designed for optimum
performance and torque when operated between 6100–6400
rpm. Choose your propeller according to the chart and to achieve
approximately 6300 rpm on the ground for best performance
and the lowest noise signature. Maximum horsepower occurs
between 7200–7400 rpm, but expect much higher propeller
noise at these tip speeds.

45GX

58GX

Aerobatics

Two-blade
Three-blade

Two-blade

Three-blade

Scale flying

22x10

26x8 26x10

21x10

24x10

24x12

22x8 23x8 23x10 24x8 24x10

21x12 22x8 22x10

22x12 24x9 24x10

24x8 24x9 24x10 24x12

25x7 25x8 25x9 25x10

26x7 26x8 26x9 26x10

25x12

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4

Starting the Engine

The new Evolution Engine carburetor comes adjusted to a
basic setting. This setting should be maintained during the
initial break in runs.

Before you first start the engine, make sure that the spark
plug is screwed in and tightened and that the plug socket
is fitted in place and fastened down properly. Fix the ignition
sensor in the proper position above the magnet with the
screws enclosed. Follow the directions in the Ignition System
addendum to program the ignition module in your model.

Important: Never turn the engine over with the ignition turned
on unless the spark plug is inserted in the plug socket. This
could lead to ignition damage.

Fuel for the Evolution Gas Engine

The Evolution® Gas engine has been designed to run on a mixture of high-quality unleaded gasoline and synthetic oil intended for racing
2-stroke gasoline engines. For the run-in period of the new engine, mix the fuel in a ratio of 30 parts gasoline to 1 part lubricant. After
run-in, use a ratio of 40 parts gasoline to 1 part lubricant.

Carburetor Adjustments 45GX

Basic setting: Adjust needle (L) for low rpm range 2 turns.
Adjust needle (H) for high rpm 1 turn and 30 minutes.

Carburetor Adjustments 58GX

Basic setting: Adjust needle (L) for low rpm range 1 turn and 45 minutes.
Adjust needle (H) for high rpm 1 turn and 45 minutes.

Air Pressure Inlet
Adjusting Needle L

Adjusting Needle H

Choke Lever

Pressure Inlet

58GX Carburetor Shown

Starting With Easy Start Feature

1) Make sure the ignition switch is on and the throttle is set at a slightly high idle setting. Be sure to have a helper hold the model
securely. The Easy Start feature will have the choke closed at this time. Give the propeller a few quick flips. If the engine starts, the
Easy Start system will automatically open the choke, and modulate its position as necessary to keep the engine running until warm.

2) If the engine does not start immediately, please note the following:

a) The Easy Start System will keep the choke closed for the first 4 flips of the propeller, then;

b) The choke will go to a half-open position for the next 4 flips of the propeller, then;

c) The choke will be fully opened for the next 4 flips of the propeller, then;

d) The Easy Start system will start the entire sequence over again by closing completely the choke.

3) The above steps assure a situation that will not flood the engine, and allow for easy starting procedures, whether it is your first, or
your tenth, flight of the day.

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