Evolution Engines EVOE33GX User Manual
33cc
GA S/PE T ROL
Evolution® Gas Engines
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NOTICE
All instructions, warranties and other collateral documents are subject to change at the sole
discretion of Horizon Hobby, Inc. For up-to-date product literature, visit horizonhobby.com
and click on the support tab for this product.
Meaning of Special Language
The following terms are used throughout the product literature to indicate various levels
of potential harm when operating this product:
NOTICE: Procedures, which if not properly followed, create a possibility of physical property
damage AND a little or no possibility of injury.
CAUTION: Procedures, which if not properly followed, create the probability of physical
property damage AND a possibility of serious injury.
WARNING: Procedures, which if not properly followed, create the probability of property
damage, collateral damage, serious injury or death OR create a high probability of
superficial injury.
WARNING: Read the ENTIRE instruction manual to become familiar with the features
of the product before operating. Failure to operate the product correctly can result
in damage to the product, personal property and cause serious injury.
This is a sophisticated hobby product and NOT a toy. It must be operated with caution and
common sense and requires some basic mechanical ability. Failure to operate this Product
in a safe and responsible manner could result in injury or damage to the product or other
property. This product is not intended for use by children without direct adult supervision.
Do not use with incompatible components or alter this product in any way outside of the
instructions provided by Horizon Hobby, Inc. This manual contains instructions for safety,
operation and maintenance. It is essential to read and follow all the instructions and warnings in the manual, prior to assembly, setup or use, in order to operate correctly and avoid
damage or serious injury.
CAUTION: This product can become extremely hot when in use, which could lead
to burns.
Age Recommendation: Not for children under 14 years. This is not a toy.
Safety Warnings
Model engines produce a substantial amount of power, which can create unsafe situations if not
used correctly. Always use common sense and observe all safety precautions when operating,
handling or performing any procedure involving your engine. Failure to follow safety precautions
could result in serious injury and property damage.
• Always ensure spectators, especially children, are at least 30 feet away when running
the engine.
• Always ensure that the propeller is securely attached to the engine shaft and all retaining
fasteners are tightened properly before EACH flight. Use of blue threadlock to tighten nuts
is advisable.
• Always keep small parts out of the reach of children as they can be choking hazards.
• Always secure the airplane before powering the engine.
• Always keep your face and body away from the path of the propeller blades when starting
or running your engine.
• Always stand behind the propeller when making carburetor adjustments.
• Always wear safety glasses or goggles when starting and running your engine.
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• Always keep your fuel in a safe place away from sparks, heat or anything that can ignite.
• Always ensure the aircraft is secure and will not move once the engine is started.
• Always rebind your transmitter to your receiver(s) after setup and before rst ight.
• Always ensure the throttle failsafe is set to low throttle in your transmitter.
• Always perform a range check prior to ight.
• 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, ngers, 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 conrm 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, mufers and/or tuned pipes until they have had time to cool.
They can become extremely hot when in use.
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Introduction
Congratulations on your purchase of one of the exciting new engines in the Evolution® gas
engine series. All of the Evolution brand gas engines have been painstakingly designed and
tested to ensure a hassle-free experience without giving away anything in expected performance
or durability and are backed by a 2-year limited warranty. This manual, when read and followed,
will guide you through the simple steps to your success. Welcome to the Evolution family.
33cc Gas Engine Design
Starting with our already proven glow engines enjoyed by thousands around the world, we
endeavored to take that excitement and experience into the realm of gasoline fuel to provide
you with a complete package; great performance and low cost of operation.
Step 1 Start with a ‘clean sheet of paper’. This is a completely new engine designed as a
powerhouse for your 20–30cc aerobatic and scale airframes. We kept ease of use
and reliability at the forefront of the design process to ensure an excellent operating
experience.
Step 2 Utilize a known and proven Walbro carburetor system that will be reliable and provide
hassle-free use by the owners, and add the appropriate throttle and choke levers that
simplify the engine control and installation.
Step 3 Design the proper muffler system with appropriate volume and muffler orientation that
allows a great looking installation while providing appropriate noise reduction.
Step 4 Design operating accessories that enhance the “new to gas (petrol)” user experience.
• Because the amount of fuel consumed is one third that of a comparable sized
glow engine, the construction and reliability of the fuel delivery system to the
carburetor becomes three times as critical. Microscopic pieces of dirt that used
to safely pass through the larger fuel passages of a glow carburetor will wreak
havoc on a gasoline system. By using a quality inline lter like our Inline Filter
(EVOA105) we can take care of the dirt problem. One of these is included with
your engine.
• The same holds true for air bubbles from the tank or any small leak in the fuel
tubing; what would pass harmlessly through a glow carburetor simply is not tolerated in a gasoline system because the air bubbles are effectively three times
the size they used to be. We have developed and sourced an excellent felt filter
clunk that, when used in the tank, stops all the air bubbles from moving into the
fuel delivery tubes. This felt clunk is critical to successful and reliable operation.
One of these is included with your engine.
• We found that high mufer temperatures would destroy normal Tygon
(the go-to choice for gasoline engines) within minutes. We found that Neoprene
tubing would withstand the temperatures but it tended to degrade quickly in
use. We sourced the proper sized uoroelastomer tubing (FKM tubing), which
withstands not only the high temperatures, but its durability is much greater
than that of either Tygon or Neoprene. The added bonus is that it fits and holds
well to the fuel fittings without any need for additional wire or tie-wrap keepers.
We have included a supply of this tubing with your engine.
®
tubing
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Included Content
ENGINE
• Mufer (EVOG33601)
• Mufer Screws & Gasket (EVOG33100A)
• Spark Plug (EVOG33350)
• Evolution/Spektrum™ Telemetry RPM
Adapter Cable (EVOA107)
• Large Gas-FKM Fuel Tubing (EVOA109)
• Large In-line Fuel Filter (EVOA111)
• Large In-tank Felt Filter/Clunk (EVOA112)
Spark Plug
Choke Arm
High-Speed
Needle
Low-Speed
Needle
Installing the Engine
Rail-mount Installation
1. Remove the 4 screws which attach the
rear-mount.
2. Remove the rear-mount and replace the 4
screws with the shorter M3 screws included
with this engine.
3. Secure the engine mount on the airplane
firewall. Tighten the engine mount screws
in the firewall.
4. Install the engine on the engine mount
according to the airplane manufacturer’s
instructions.
OPTIONAL ITEMS
• Tachometer (HAN156)
• Propeller 17 x 8 (APC17080) for break-in;
18 x 8 (APC18080) for normal ight
• Optical Electronic Ignition Kill Switch
(EVOA100)
• Evolution Synthetic 2-Cycle Oil, (EVOX1001Q)
• Ultra Fuel Pump (HAN155)
Muffler
Fuel Nipple
Throttle
Arm
Rear-mount Installation
1. Secure the engine to the airplane firewall
using either M5 or 10-32 bolts. Use spacers
or standoffs as needed to set the correct
firewall-propeller distance according to the
airplane manufacturer’s instructions.
WARNING: Tighten all engine
mounting screws before each flight. If
you do not tighten the engine
mounting screws, the screws may
vibrate loose and cause the engine to
separate from the fuselage.
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Installing the Muffler
The muffler mounting accessory package
includes mounting screws (2), lock washers
(2), muffler gaskets (2) and L- wrenches (2).
We suggest using high-temperature RTV as a
locking agent on the muffler screws to keep
them tight.
Connecting the Throttle Linkage
1. Put a lock washer on each of the muffler
screws. Push the muffler screws through
the muffler.
2. Place the muffler gasket over the muffler
mounting screws.
3. Align the mufer gasket with the exhaust
opening and the muffler mounting screws.
4. Tighten the muffler screws.
4. Adjust the throttle arm so the arm is 90
degrees to the throttle pushrod.
5. With the throttle servo centered, install a
servo arm with a hole at least 15mm (5/8
in) from the center of the arm.
6. Use a clevis to attach the throttle linkage to
the servo arm.
1. Use a secure method to attach the
throttle linkage to the throttle arm on the
carburetor.
2. Power on the transmitter and receiver.
3. Move the throttle stick to the middle stick
position.
Adjusting the Throttle Opening
1. Lower the throttle and center the throttle
trim.
2. Adjust the length of the throttle linkage
until the throttle is open 1mm.
3. Move the throttle stick up to conrm the
throttle opens. If the throttle does not
open, reverse the throttle channel in your
transmitter.
4. Move the throttle stick and throttle trim
down to confirm the throttle closes.
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15mm
5. If you reversed the throttle channel in your
transmitter and you are using a 2.4GHz
radio system, you must re-bind your radio
system to set the correct failsafe position.
You may need to adjust the endpoints on your
radio to achieve full throttle motion. Using
a longer servo arm will help obtain the best
throttle geometry.
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