Evolution Engines 15GX 15cc User Manual

15cc

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 conrm 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, mufers 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 one of the exciting new engines in the Evolution® small block
gas engine series. All of the Evolution brand gas engines are designed from the start to provide
you with excellent performance at a fraction of your previous operating costs. We have painstak­ingly designed and tested each engine to insure a hassle-free experience without giving away
anything in expected performance or durability. This manual, when read and followed, will guide
you through the simple steps to your success. Welcome to the Evolution family.

Small Block 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 great engine. The Evolution glow engines have provided thousands of users

excellent performance.

Step 2 Design a new carburetor system that will be reliable and provide for hassle-free use by

the owners. This new carburetor, with already proven technology, was modified to fit in
the available space in front of the cylinder and the unique needs of a gasoline fueled
engine. Built on to the front of the carburetor is a crankcase-pressure driven regultar
system. This system takes fuel from a muffler pressurized tank and meters it properly in
all attitudes of flight. A new cat’s eye style fuel metering system was added to allow for
more controllability to the low and mid-range throttle positions.

Step 3 Design the proper muffler system to handle the extra heat and expansion of the burnt gas

mixture when compared to a glow system. These changes included adding volume to the

muffler, including a much larger muffler through bolt to handle the heat and stress, and
enlarging the outlet of the muffler to minimize backpressure while still providing noise
reduction.

Step 4 Design operating accessories that enhance the user experience. During our extensive

2 1/2-year testing program we discovered a lot of new techniques and obstacles that are
unique to gasoline fueled small block engines.

• 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 filter 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 mufer 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.

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®

tubing

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Included Content

ENGINE

• Mufer (EVOG15601)

• Mufer Screws & Gasket (EVO9191A)

• Spark Plug (EVOG10350)

• Evolution/Spektrum™ Telemetry RPM
adapter cable (EVOA107)

• Medium Gas-FKM Fuel Tubing (EVOA104)

• In-Line Fuel Filter (EVOA105)

• In-tank Felt Filter/Clunk (EVOA106)

Fuel Nipple

High-Speed
Needle

Muffler

Spark Plug

OPTIONAL ITEMS

• Tachometer (HAN156)

• Propeller 13 x 6 (EVO13060) for break-in;
14 x 6 (EVO14060) for normal ight

• Optical Electronic Ignition Kill Switch
(EVOA100)

• Evolution Synthetic 2-Cycle Oil, (EVOX1001Q)

• Ultra Fuel Pump (HAN155)

Spark Plug

Muffler Nipple

Muffler

Installing the Engine

1. Secure the engine mount on the airplane
firewall. Tighten the engine mount screws
in the firewall.

2. Install the engine on the engine mount
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.

Low-Speed

Needle

Throttle

Arm

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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).

Connecting the Throttle Linkage

1. Put a lock washer on each of the muffler
screws. Push the muffler screws through
the cylinder head.

2. Place the muffler gasket over the engine
mounting screws.

3. Align the mufer gasket with the exhaust

opening and the muffler mounting screws.

4. Tighten the muffler screws.

IMPORTANT: Tighten the muffler screws after

five tanks of fuel. The muffler screws may

loosen from heat and vibration.

It is important that you tighten the muffler

through bolt after each of the first three,
full tank engine runs. The heat will cause
expansion of the through bolt and muffler
body parts. After the third tightening, no
further muffler loosening should occur.

To tighten the muffler through bolt:

1. Loosen the muffler lock nut.

2. Tighten the muffler through bolt screw.

3. Tighten the mufer lock nut.

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.

4. Adjust the throttle arm so the arm is 90

degrees to the throttle pushrod.

5. Center the throttle servo. Install a servo arm
with a hole 11mm (7/16 in) from the center

of the arm.

6. Use a clevis to attach the throttle linkage to

the servo arm.

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11mm

1.5mm