Evolution Engines
45GX/58GX
USER GUIDE
© 2005 Manufactured exclusively for Horizon Hobby, Inc. 800-535-5551
www.horizonhobby.com
8103
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.
2
Before using this engine, please read these instructions carefully.
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 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.
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
45GX
Two-blade propellers:
22x10, 22x12, 22x14
23x8, 23x10, 23x12
24x8, 24x10, 24x12
Three-blade propellers:
21x10, 21x12
22x8, 22x10
58GX
Two-blade propellers:
22x10, 22x12, 22x14
24x8, 24x9, 24x10, 24x12
25x7, 25x8, 25x9, 25x10, 25x12
26x7, 26x8, 26x9, 26x10
Three-blade propellers:
22x10, 22x12
24x9, 24x10, 24x12
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.
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
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
1-877-504-0233
productsupport@horizonhobby.com
54
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 mount 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.
1) When you are ready to start your engine, make sure that the ignition is switched off, the choke valve is closed and the throttle valve is
partly open. Confirm that fuel is filling the fuel line to the carburetor then switch the ignition to the on position. Flip the propeller smartly
until the engine fires. With the choke in the closed position, the engine will fire then quit.
2) Open the choke valve and set the throttle at a slightly high idle position. Be sure to have a helper hold the model securely. Give the
propeller a few quick flips. When the engine starts, allow it to idle for 30-45 seconds in order for it to warm up to operating temperature.
At this point you can proceed to test the carburetor settings before flying your model. See the following section regarding carburetor
adjustment.
3) If the engine does not start, leave the throttle at the high idle position, turn the ignition off, then on and close the choke valve. Start the
engine with throttle at the fast idle position and the choke valve closed. The engine should fire and quit. If it does, repeat step 2 above.
4) At this point, if the engine still will not start, unscrew the spark plugs and check the contacts. Clean any possible excess fuel (i.e. an
indication of engine flooding) and screw them in again. Further starting should only be done with the throttle at idle position and the choke
in the open position. If the plug is dry, then probably not enough fuel has been drawn into the carburetor. If that is the case, check for
proper fuel feed and then return to the instructions given in paragraph 1.
Having started the engine, leave it running for about 5 minutes at a higher idle speed. Then run it for about 20 minutes, while
changing revolutions from idle to 1/2–3/4 of the range and shortly holding each position—gradually prolong the holding periods. After
10 minutes of operation, open the throttle to maximum for a period of about one minute. At this point, stop the engine and let it cool
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.
down. Then restart it and check the adjustment. If everything is all right, you can make your first flight. During the first few flights. do
not overload the engine and do not let it run at high revolutions for long periods of time (very important during hot weather). Use up all
the fuel that was mixed with the oil that is included with your engine. From then on, fuel and oil should be mixed in the proportion 40:1.
Starting the Engine Continued
First, start and warm the engine for 30-45 seconds before attempting to adjust the carburetor. In order to confirm that your engine is
properly adjusted you should follow the procedure below.
1) Move the throttle from idle to 2/3 of the full throttle position quickly (fast acceleration). Then repeat three times – if the engine
accelerates smoothly go to step 3 below. If acceleration is not smooth, go on to step 2.
2) Faulty acceleration and a tendency to quit is usually attributable to a poor fuel mixture in the medium rpm range. Stop the engine
and recheck the fuel feed (the fuel line must not be pinched or broken). Restart the engine and test acceleration again. If the problem
persists, adjust the carburetor. Open the low speed needle by 1/8 turn and retest. If acceleration is smooth, open the needle by another
1/8 turn—this should be done because the needle was previously set too lean; if atmospheric conditions have changed recently you
may have to readjust the needle. If the engine continues to not accelerate properly, open the low speed needle by 10 minutes. If the
engine’s operation does not improve, shut it off and check the basic setting, restart the engine and test the acceleration. If the engine
runs correctly, go to step 3. If it continues to not accelerate properly, open the low speed needle by another 10 minutes. If acceleration is
faulty, the defect is likely to lie somewhere other than an incorrect adjustment.
3) If the engine accelerates correctly, according to the above test, set it at idle speed and accelerate to full speed. Repeat twice more. If
the engine functions correctly, go to step 4. If it cuts out, open the low speed needle by another 1/8 turn more.
4) If the engine reacts correctly set it at full speed. If revolutions do not drop, the engine has been adjusted successfully. If revolutions
seem to drop, open the high-speed needle by approx. 5–10 minutes.
Caution!
The engine must be stopped while you adjust the carburetor in order to prevent injury by the propeller.
Carburetor Adjustment
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 10 minutes.
Air Pressure Inlet
Adjusting Needle L
Adjusting Needle H
Choke Lever
Pressure Inlet
58GX Carburetor Shown
76
If the engine does not start
-
check and use a new spark plug if needed.
(Check the spark: put the plug into the cable end and by turning
the engine you´ll see the necessary spark. Note: The plug must
touch a metal part of the engine.)
- check fuel lines.
- check for proper mechanical function by turning the
engine over.
- check that the carburetor is correctly installed.
- remove the carburetor cover from the feed side; check
the filter and blow off carburetor with compressed air
(Caution: When using compressed air, use eye protection.);
when re-assembling be
careful to maintain the proper order of
the components.
- check the vacuum feed line.
Mechanical Faults
If the engine can not be turned over easily
- a likely cause is the piston in the cylinder is seized: loosen and
unscrew the cylinder bolts.
- carefully remove the cylinder.
- visually examine the piston and crankcase to find the likely
cause of the engine’s mechanical problem.
Note: Mechanical repairs must always be completed by a
professional service department.
Trouble-Shooting Guide
Engine Specifications
Bore
Stroke
Displacement
Weight without ignition*
Weight of ignition unit
RPM range
38mm
38mm
45cc / 2.6 cu in
1290 g / 45.5 oz
165 g / 5.8 oz
1000–7500 rpm
Maximum power output**
Maximum torque**
Gasoline
Lubrication
5.2 hp / 6200 rpm
4.2 ft-lb / 6100 rpm
Unleaded 95-octane
Oil w/gasoline
in mixture 1:40
* The value in the table above stands for the weight of a completely assembled engine, including the spark plug, carburetor,
drive washer and prop screws.
** Power output varies with the exhaust used. The value given in the table stands for the maximum available power output.
45GX Evolution Engine Dimensions
A
180mm
C
71mm
E
78mm
G
M10x1mm
B
122mm
D
78mm
F
6.6mm
H
55mm
Bore
Stroke
Displacement
Weight without ignition*
Weight of ignition unit
RPM range
42mm
42mm
58cc / 3.6 cu in
1820 g / 64.2 oz
165 g / 5.8 oz
1000–7500 rpm
Maximum power output**
Maximum torque**
Fuel
Lubrication
8.5 HP / 6950 rpm
5.1 ft-lb / 6400 rpm
Unleaded gasoline
Oil w/gasoline
in mixture 1:40
58GX Evolution Engine Dimensions
A
190mm
C
75mm
E
78mm
G
M10x1mm
B
140mm
D
78mm
F
6.6mm
H
55mm
58GX
45GX
Evolution Engines Ignition System
The spark ignition included with your Evolution® gas engine is a modern generation electronic ignition. There are many useful
functions built into the microprocessor of this unit.
In addition to the basic ignition functions, the unit has two FAIL-SAFE features.
1. After 90 seconds of inactivity it automatically switches to an inactive state. In order to restart normal operation it is necessary to
turn the battery switch off and then back on. This function will preserve battery life should the switch be left in the on position
during inactivity.
2. During normal operation the battery voltage will decrease. When the voltage reaches 4.4V the ignition unit will limit maximum rpm
in the range of 3000–4000 rpm. This is an indication to land the model as soon as practical.
Installation of the Ignition Unit
The electronic ignition unit requires a 4.8–6 volt battery source separate from your model’s radio system. A 600mAh battery
will provide more than 1.5 hours of operation. The supplied battery connector is compatible with the JR
®
radio battery
connector.
While installing the ignition unit in your model be careful to have all parts that are connected to the unit and the engine
situated as far as practical from the radio receiver and radio antenna. The throttle servo should be mounted a distance of
8–12 inches from the engine. The spark plug cable must not touch any part of the model structure as vibration may damage
the cable. If this is not practical it will be necessary to provide an insulation material for the cable. The ignition unit itself
should be wrapped in foam rubber to prevent engine vibration from damaging the electronics. All components must be
protected from contact with engine fuel.
Plug
Plug
Cap
Probe
BASIC PROBE AND MAGNE T ADJUSTMENT
Magnet
A
Magnet B
Magnet
A
Probe
Propeller Driver
Direction
of Rotation
Propeller Driver
Distance of probe from magnet 0:5 mm
Screw securing the connector in required position
Red
Brown
Orange
+
Data Out
Battery
Connector
To Battery
Switch
Magnet A position on the driver
corresponds to the
TOP DEAD CENTER of the piston.
Basic pre-ignition adjustment
is given by magnet A.
Magnet distance is 180 degrees.
Ignition
Module
Technical data
Supply Voltage 4.8 – 6 V
Current Consumption 90 – 120mAh at Idle
500mAh/9000 rpm
Plug Voltage 18 Kv
Weight 140 g
Dimension 55x50x25mm
Sensor Magnet Space max. 0.5mm (.020”)
Plug Spark Gap .6mm (.025”)
Working Temperature -10 to 85 deg C
Installation of the Ignition Unit Continued
8 9
Part Number Description Part Number Description
EVO30040101 Crankcase EVO30041101 Drive Washer
EVO30040202 Front Bearing EVO30041102 Drive Washer Key
EVO30040204 Packing EVO30041103 Propeller Nut
EVO30040203 Rear Bearing EVO30041104 Propeller Washer
EVO30040301 Rear Cover EVO30041105 Propeller Screw
EVO30040302 Rear Cover Screws Set EVO30041107 Propeller Screws Set
EVO30040303 Rear Cover O-Ring EVO30040306 Carburetor Flange
EVO30940304 Pressure Nipple
EVO30940305 Pressure Nipple Gasket
EVO30040307 Carb. Flange Gasket
EVO30040401 Cylinder
EVO30040308 Carb. Flange Screws Set
EVO30040402 Cylinder Screws Set
EVO30041301 Reed Valve Case
EVO30040403 Cylinder Nut
EVO30041302 Reed Valve
EVO30040404 Cylinder Gasket
EVO30041303 Reed Valve Screws
EVO30040405 Exhaust Screws Set
EVO30041304 Reed Valve Gasket-Upper
EVO30040406 Exhaust Nut
EVO30041305 Reed Valve Gasket-Bottom
EVO30040407 Exhaust Flange Gasket
EVO30041306 Reed Valve Strap
EVO30040701 Piston
EVO30041307 Carburetor Screws
EVO30040702 Piston Ring
EVO30013312 Electronic Ignition Unit
EVO30040801 Piston Pin
EVO3306 Spark Plug
EVO30040802 Piston Pin Retainer
EVO30941403 Spark Plug Washer
EVO30040901 Connecting Rod
EVO30941404 Locking Screw
EVO30040904 Connecting Rod
Washer EVO30941405 Ignition Sensor Fixing Screws
EVO30041001 Crankshaft
EVO30043225 Carburetor
EVO30010101 Crankcase EVO30011101 Drive Washer
EVO30010202 Front Bearing EVO30011102 Drive Washer Key
EVO30010204 Packing EVO30011103 Propeller Nut
EVO30010203 Rear Bearing EVO30011104 Propeller Washer
EVO30010301 Rear Cover EVO30011105 Propeller Screw
EVO30010302 Rear Cover Screws Set EVO30011107 Propeller Screws Set
EVO30010303 Rear Cover O-Ring EVO30010306 Carburetor Flange
EVO30940304 Pressure Nipple
EVO30940305 Pressure Nipple Gasket
EVO30010307 Carb. Flange Gasket
EVO30010401 Cylinder
EVO30010308 Carb. Flange Screws Set
EVO30010402 Cylinder Screws Set
EVO30011301 Reed Valve Case
EVO30010403 Cylinder Nut
EVO30011302 Reed Valve
EVO30010404 Cylinder Gasket
EVO30011303 Reed Valve Screws
EVO30010405 Exhaust Screws Set
EVO30011304 Reed Valve Gasket Upper
EVO30010406 Exhaust Nut
EVO30011305 Reed Valve Gasket Bottom
EVO30010407 Exhaust Flange Gasket
EVO30011306 Reed Valve Strap
EVO30010701 Piston
EVO30011307 Carburetor Screws
EVO30010702 Piston Ring
EVO30013312 Electronic Ignition Unit
EVO30010801 Piston Pin
EVO3306 Spark Plug
EVO30010802 Piston Pin Retainer
EVO30941403 Spark Plug Washer
EVO30010901 Connecting Rod
EVO30941404 Locking Screw
EVO30010904 Connecting Rod
Washer EVO30941405 Ignition Sensor Fixing Screws
EVO30011001 Crankshaft
EVO30013225 Carburetor
Part Number Description Part Number Description
45GX 58GX
10 11
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