Evolution Engines 61NX User Manual

.61NX Evolution®

Engine

USER GUIDE

© 2008 Manufactured exclusively for Horizon Hobby, Inc. 877-504-0233

www.horizonhobby.com

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Introduction

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

The Evolution NX 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 Set Right™
needle valve assemblies. Every feature is designed to
ensure success with your new engine.

Every Evolution engine has been baseline adjusted
at the factory and is ready to fly . We recommend a short
break-in period to become familiar with the 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 store or flying club can put you in touch
with an experienced pilot in your area.

Mounting the Engine

This user’s guide is intended to provide the basic
information needed to operate and maintain your
Evolution NX Engine.

Muffler

Glow Plug

Glow Plug

Muffler Nipple

Fuel Nipple

High-Speed Needle

Muffler

Securely tighten all engine mounting screws and re-check tightness
before each flying session.

Most model airplanes include an engine mount. It is
extremely important that the engine mount be securely
mounted to the airplane’s firewall and that the engine
is securely mounted to the engine mount. Follow the
instructions included with the airplane for mounting the
engine.

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

Installing the Muffler

Using the included muffler mounting screws and lock
washers, attach the muffler with the included hex
wrench. Be sure the lock washers are placed over the
screws and that one gasket is placed between the muffler
and the engine. A second gasket is included as a spare.
Securely tighten both screws with moderate torque.

Important: After five runs, retighten the muffler
mounting screws. Heat and vibration from these first
few runs can cause the gasket to compress. Once the
muffler screws are retightened, they will remain tight and
leak-free until the muffler is removed. Also, tighten the
muffler thru-bolt at this time as well—loosen the lock
nut on the back of the muffler, tighten the thru-bolt via
the screwhead at the front of the muffler then retighten
the lock nut at the rear.

Throttle Linkage

Low-Speed Needle

Throttle Arm

The muffler mounting accessory package includes mounting screws
(2), lock washers (2), muffler gaskets (2) and an L- wrench.

Attach the linkage to the throttle arm.

A clevis is recommended for attaching the throttle
linkage to the throttle. Attach the throttle linkage to the
hole in the throttle arm (see photo above).
Turn on the radio. With the throttle stick at 1/2 throttle,
install the arm on the servo so that the arm is 90° to the
throttle pushrod.

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3

Select a servo arm that has a hole located 11mm or
7/16" out from center and attach the other end of the
throttle linkage. (see photos below)

Attaching the Fuel Lines

Attaching the Propeller and Spinner

Starting the Evolution Engine

Fuel

We recommend using high quality Cool Power Omega,

®

Hangar 9
10 to 15% Nitro. The Evolution engine has been test
run using these fuels. If another brand of fuel is used, it
may be necessary to slightly adjust the needle valves to
compensate for the differences in fuel.

AeroBlend™ or Power Master fuels containing

Linkage 11mm out

1/2 throttle

1mm

At low throttle, mid-trim, the throttle barrel should be 1mm open.

With low throttle and mid-trim (idle position), the throttle
barrel should be open 1mm, giving a low rpm idle (see
photo above). Adjust the length of the pushrod 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
and low-trim should completely close the throttle barrel.
Reverse the servo throw if necessary.

Fuel Line

Vent Line

Vent Line

Fuel Line

Using medium silicone fuel tubing, attach the fuel tank’s
clunk line to the fuel nipple. This line will supply fuel to
the engine. Attach the vent line to the muffler pressure
nipple. This line pressurizes the fuel tank with the muffler
pressure, creating consistent fuel flow, regardless of the
airplane’s attitude.

Recommended propellers:
Break in

11 x 7

Sport

11 x 7, 11 x 8
12 x 6, 12 x 7
13 x 6, 13 x 7

Securely tighten the prop nut using a wrench.

Remove the prop nut and prop washer from the engine.
Install the spinner back plate. Install the propeller, the
prop washer and then the prop nut in that order (see
photo). Securely tighten the prop nut using a wrench.
Install the spinner cone.

Glow Plug

The Evolution engine comes with a specially designed
“Super Plug” that prevents idle and transition flameouts.
The plug’s unique shape directs incoming fuel/air mixture
away from the plug element. When replacing the plug,
be sure to replace it with another Evolution 2- or 4-cycle
Super Plug (EVO6P1).

Starting the Engine

Step 1. Fill the tank with the above-mentioned 10 or

15% fuel.

Step 2. Reattach the fuel lines, making sure the vent

and clunk line are attached to the fuel nipple
and the muffler pressure nipple.

Caution: Do not attach the glow driver yet.
Step 3. With the throttle fully open, place your thumb

over the carburetor and flip the prop clockwise
through 6 complete revolutions, thus priming the
engine.

Step 4. Close the throttle to the idle position and have a

helper hold your airplane.

Note: It may be necessary to slightly adjust

the length of the throttle pushrod to achieve
the correct mid-trim, low-stick idle position.

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The Hangar 9 START KIT (HANSTART) includes everything needed,
except fuel and starter, to get the Evolution engine running.

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