Evolution 1.20NX Evolution User manual

© 2009 Manufactured exclusively for Horizon Hobby, Inc. 877-504-0233
www.horizonhobby.com
Printed 5/09 15296
1.20NX Evolution®
Engine
USER GUIDE

3
2
Table of Contents
Content Included ............................................................................................................. 3
Introduction ..................................................................................................................... 3
Mounting the Engine ....................................................................................................... 5
Installing the Muffler....................................................................................................... 5
Throttle Linkage............................................................................................................... 5
Attaching the Fuel Lines ................................................................................................. 6
Attaching the Propeller and Spinner............................................................................. 7
Starting the Evolution Engine......................................................................................... 7
Needle Limiters................................................................................................................ 8
Low-Speed SetRight Needle Valves ............................................................................... 9
Engine Break-in............................................................................................................... 9
Why would fuel go “bad”?............................................................................................ 10
How to Tell If Your Glow Plug Is Bad............................................................................ 10
1.20NX Evolution Engines Specifications.................................................................... 11
Troubleshooting Guide .................................................................................................. 11
Maintenance .................................................................................................................. 11
Exploded View................................................................................................................ 12
Cross Reference of Evolution 1.20NX Part Numbers................................................. 13
Warranty Information ................................................................................................... 14
Content Included
Engine Optional Items
Muffler (EVO110601) Startup Field Pack (HANSTART)
Muffler Screws & Gasket (EVO110E100A) Tachometer (HAN156)
Glow Plug (EVOGP1) Propeller 15 x 6 (EVO15060) 16 x 6 (EVO16060)
Instruction manual Blue Block After Run Engine Oil Dispenser (EVOX1001)
Decal sheet Blue Block After Run Engine Oil Refill (EVOX1000)
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 1.20NX Engine.
The Evolution 1.20NX 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.
This user guide is intended to provide the basic information needed to operate and maintain your Evolution 1.20NX
Engine.
Every Evolution engine has been baseline adjusted at the factory and is ready to fly . We recommend a 20-minute 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.

54
Mounting the Engine
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.
Important: After the first few 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
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.
Securely tighten all engine mounting screws and recheck tightness
before each flying session.
Attach the linkage to the throttle arm.
The muffler mounting accessory package includes mounting screws
(2), lock washers (2), muffler gaskets (2) and an L- wrench.
Low-Speed Needle
Needle Limit Collar
High-Speed Needle
Muffler
Muffler
Glow Plug
Glow Plug
Throttle Arm
Muffler Nipple
Fuel Nipple

76
Attaching the Propeller and Spinner
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.
Starting the Evolution Engine
Fuel
We recommend using high quality Cool Power, Omega
or Power Master fuels containing 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.
Glow Plug
The Evolution engine comes with a specially designed
“Super Plug” that prevents idle and transition flameouts.
The plug’s unique shape directs the 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 (EVOGP1).
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. The High Speed needle valve should be turned
open 2 to turns from closed for the initial first
start. (remember to follow the proper break-in
procedures for a ringed engine) see page 9
Step 4. With the throttle fully open, place your thumb
over the carburetor or the exhaust outlet of the
muffler and flip the prop clockwise through 6
complete revolutions, thus priming the engine.
Step 5. Close the throttle to the idle position and have a
helper hold your airplane.
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).
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.
Note: It may be necessary to slightly adjust
the length of the throttle pushrod to achieve
the correct mid-trim, low-stick idle position.
Attaching the Fuel Lines
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*
15 x 6
Sport*
15 x 6, 15 x 7
15 x 8, 16 x 6
16 x 8
16 x 10
* 2-blade propellers The Hangar 9 START KIT (HANSTART) includes everything needed,
except fuel and starter, to get the Evolution engine running.
At low throttle, mid-trim, the throttle barrel should be 1mm open.
1mm
1/2 throttle
Linkage 11mm out
Vent Line
Fuel Line
Fuel Line
Vent Line
Securely tighten the prop nut using a wrench.

98
Step 2. Low-Speed Needle Adjustment, cont.
4. The low-speed fuel mixture may be too lean if
the engine stops at the lowest idle position or it
stops when the throttle is rapidly opened from
the idle position. Correct this by rotating the
SetRight adjustment bar counterclockwise in small
increments until the engine transitions smoothly
without hesitation upon opening the throttle rapidly
from idle.
Low-Speed SetRight Needle Valves
The design of the SetRight needle valve system is such
that, during normal operating conditions, the typical
user will find that the range of adjustment allowed by
the system is more than adequate for most situations.
As a matter of fact, we intended this to be used as a
tool to identify operating problems. If you find that the
range of adjustment allowed by the SetRight needle is
inadequate after your initial period of running, then a
problem in your engine system has occurred. This might
be a bad glow plug, dirty or old fuel, an air leak in the
fuel system somewhere or any number of other reasons.
Do not make any permanent adjustment range changes
to the SetRight needle system if it was once working
correctly for you and now does not. Investigate other
problems first.
However, occasionally due to atmospheric, altitudinal
or fuel conditions, you may find that the range of
adjustment built into the SetRight needle valve system
is inadequate for your needs. These conditions are rare
and easy to fix.
Low-Speed SetRight Needle Valve Correction
Should the low-speed SetRight needle valve
need to be adjusted outside the factory-
established parameters, follow these steps:
A. Loosen the setscrew found on the ring of
the SetRight assembly to which the
adjustment bar is attached.
B. Rotate the needle valve itself (small
slot-headed screw inside the blue ring of
the SetRight assembly) clockwise to lean
the mixture or counterclockwise to richen
the mixture as desired.
C. Retighten the setscrew on the ring of
the SetRight assembly and you have
re-established a new range of motion.
Engine Break-in
Ringed engines need a different break-in procedure
than a typical ABC-style piston and liner construction.
The component that provides the compression seal is
a spring steel ring that needs to fit itself to the minute
scratches on the interior surface of the cylinder liner.
With care in this process your ringed engine will last a
very long time. If you ever notice that the power seems
to have dropped on your EVO 1.20, a quick installation
of a new ring and a new break-in period will restore your
engine’s health to near-new condition.
1. Mount the engine on a test stand or in the airplane
you intend to use the engine in. If there is cowling
around the engine, it would be a good idea to do
the break-in process with the cowl removed to allow
adequate access to and cooling of the engine.
2. Fill the fuel tank with the fuel you intend to use
(10–15% nitro).
3. Start the engine and leave it running rich, with the
glow igniter attached if necessary.
4. Open the throttle wide open, and let the engine run
at a rich ‘4-cycle’ (where the engine actually doesn’t
fire each and every time. With experience you will be
able judge this easily. For those new to nitro engines,
you will hear a sharp increase in rpm and sound when
the engine transitions from a ‘rich 4-cycle’ to a 2-cycle
run). Let the engine run through the tank at this
setting, or at least 10 minutes, then shut it down and
let it cool completely.
5. Restart the engine, but this time to vary the
needle settings, with brief periods of 2-cycle running
alternated with longer periods of 4-cycle running,
through the next tank of fuel for at least 10 minutes.
Note: A good way to judge the time limits for the
2-cycle and 4-cycle running periods is to touch the
cylinder head with a free finger while adjusting
the needle valve. When the engine is at a 2-cycle,
you want to richen the mixture when you can no
longer touch the side of the cylinder with your finger.
Conversely, the engine has cooled enough when you
Step 5. Attach the glow driver.
Step 6. Turn the engine over using an electric starter.
The engine should fire within seconds of applying
the starter.
Step 7. Allow the engine to idle for 30 seconds. Adjust the
throttle trim if necessary to achieve a constant
slow idle.
Step 8. With the glow driver still attached and a helper
securely holding the airplane, advance the
throttle smoothly to full throttle. The engine will
transition to full rpm.
Step 9. Reduce the throttle to idle and remove the
glow driver.
Setting the Needle Valves
The low-speed needle has a limiter that prevents
over-adjustment. If your engine starts from the above
procedure, but won’t reliably continue to run with the
glow driver removed, follow the steps below.
Step 1. High-Speed Needle Adjustment
With the engine running, advance the throttle
to full throttle while a helper securely holds your
airplane. Carefully pinch and release the fuel line
to temporarily restrict the fuel flow.
Caution: Do not reach over the propeller while
the engine is running.
Correct: If the high-speed needle adjustment
is correct, the engine will increase rpm slightly
(about 300 rpm) and then die.
Too Rich: If the engine increases a lot (1,000
rpm or greater), the high-speed needle is too rich
and must be leaned or turned clockwise.
Too Lean: If the engine doesn’t increase rpm and
simply dies, the high-speed needle is lean and
must be richened or turned counterclockwise.
Step 2. Low-Speed Needle Adjustment
The low-speed or idle needle valve, included
with the SetRight™assembly, is preadjusted at
the factory for best performance at close to sea
level conditions. It may be necessary to fine-tune
the low-speed adjustment using the following
procedure:
1 . Start the engine and let it warm up, prior
to attempting any adjustments. Make sure
that the high-speed adjustment process is
complete before attempting to adjust the
low-speed needle valve.
2 . Close the throttle slowly. You will adjust the
low-speed needle setting by rotating the
SetRight adjustment bar clockwise to lean
the engine and counterclockwise to richen the
engine.
Caution: Do not attempt to adjust the low-speed
needle valve while the engine is running.
3 . The fuel mixture should be adjusted as
follows: The low-speed fuel mixture is too rich
if, when opening the throttle rapidly, the engine
emits smoke and "stutters" or "stumbles."
Correct this by rotating the SetRight adjustment
bar clockwise in small increments. Continue this
process until the engine transitions smoothly
from low rpm idle to high rpm without hesitation
upon opening the throttle rapidly.
Note that the low-speed needle adjustment range is limited,
preventing adjustment beyond the practical range.
Low-Speed Needle AdjustmentHigh-Speed Needle Adjustment

1110
can touch the cylinder comfortably.
6. Repeat Step 5 one more time and then the rest of
the break-in can be accomplished in the air. Set your
engine’s needle valves per the instruction manual. If
anything, continue to err slightly on the rich side and
your engine’s performance will continue to improve
over the next gallon of fuel or so.
Why would fuel go “bad”?
The largest portion of the fuel is methanol (alcohol).
Methanol is hygroscopic; it attracts moisture. This can
cause your fuel to be contaminated with water, which will
cause poor engine performance. Additionally, the UV rays
in sunlight will eventually break down the nitromethane if
the fuel jug is stored in sunlight for long periods of time.
How can you tell when your fuel has gone “bad”?
The first indication will generally be the inability to start
the engine at previously run needle-valve settings.
Another clue might be that the engine has very poor idle,
runs but bogs down tremendously during run up and/or
will not attain the same rpms that you are used to.
How do I keep my fuel fresh?
If you have the opportunity, look for someone at a flying
field on a sunny day who has a jug of fuel that is only
1/4 full. What you may notice is that there are droplets
attached to the top and sides of the container. This is
the moisture in the air that is condensing inside the jug
because of the greenhouse effect of the semi-translucent
plastic jug. This will also occur within a metal fuel can as
the sun warms the contents.
You can combat the effects of the moisture in the air by
squeezing all the extra air from your fuel container at
the end of the day or transferring your fuel into smaller
containers as the level of the fuel is reduced in your
gallon jug. Many pilots will invest in 1/2 gallon or quart-
size containers and only bring that amount of fuel to the
field on any given day. This allows their main supply of
fuel to stay at home in a controlled storage environment,
virtually ensuring problem-free fuel.
How to Tell If Your Glow Plug Is Bad
The glow plugs on the market today are designed
to provide good service to the user and may last a long
time or a short time, all dependent upon the way you
choose to operate your engine.
Physical indications that you might need to
change the glow plug are:
1. Twisted or mangled glow plug elements (usually
caused by too high a compression ratio).
2. Small “bumps” are attached to the glow plug
element. This will generally be most noticeable
during the break-in process. These are actually
tiny pieces of aluminum that have attached to the
element and will severely hinder the operation of
the glow plug.
3. The glow plug element is no longer shiny but is dull,
almost a white powder color. (This just comes with
age and is a by-product of the catalytic reaction).
The shinier the wire, the better the catalytic reaction
can be.
Operating indications that you need to change
your glow plug are:
1. The glow element will not light with a charged glow
igniter. This indicates that there is a physical short
or breakage in the element wire itself.
2. Glow plug lights but the engine will not continue
running once the battery is disconnected. (This is
usually an indication of the microscopic particles
discussed earlier.)
3. Glow plug lights, engine runs but there is a
perceptible loss of rpm at full throttle when the
battery is disconnected. This is a typical indication
that the white powder residue is building to the
point that the catalytic reaction of the glow plug is
no longer anywhere close to being optimum.
Troubleshooting Guide
Engine Won’t Fire
  •Glowstarternotcharged
- Charge glow starter
  •Glowplugburntout
- Replace glow plug
  •Nofuelisgettingtothecarburetor
- Check tank, fuel lines reversed
  •Thestarterisreversed
- Reverse the polarity on the starter cables
Engine Quits Repeatedly
  •Needlesneedadjusting
- See adjustment procedure
  •Badoroldfuel
- Replace with fresh fuel
  •Wornoutglowplug
- Replace with new EVOGP1 glow plug
Engine Runs Inconsistently
  •Holeinfuelline
- Replace fuel line
  •Badoroldfuel
- Replace with fresh fuel
Maintenance
After each flying session:
1. Fully drain the fuel from the tank.
2. Start the engine and run it until the fuel is
completely run out of the engine.
3. Try starting the engine three more times or until
it will no longer fire. This gets all the fuel out of
the engine.
Now add several drops (about 10) of after-run oil
(EVOX10000 Evolution Engine's Blue Block Rust
Inhibitor) should be applied into the carburetor and the
engine should be turned over for a few seconds with the
starter. This will prevent rust and corrosion.
Ifyou need additional helporhave anyquestions, please call
Horizon’sSupport Team. Horizon has trained technicians who
are qualified to answer your engine questions.
Evolution/Horizon Service Center
4105 Fieldstone Road
Champaign, IL 61822
877-504-0233
Disp Bore Stroke Weight Crank K
Items (c.i.) (mm) (mm) (oz) (ISO) Cylinder Propeller
EVOE1200 1.20NX"30.3 27.4 23.502 5/16 x 24 Die Cast Steel 16 x 8 @ 8500 RPM
1.20NX Evolution Engines Specifications
Dimensions (mm) A B C D E* F G H
EVOE1200 45 58 25 60 92 111 5/16 x 24 42
F
H
G
A
D
C
E = height*
F = length
G = crankshaft thread size
H = muffler bolt spacing
B
* Height is from engine C/L to top of cylinder head

13
Cross Reference of Evolution 1.20NX Part NumbersExploded View
12
No. Description
1 Crankcase with Index Pin EVO120101
2 Back Cover with Gasket EVO120102
3 Cylinder Liner & Piston Set (no ring) EVO 120202R
4 Connecting Rod EVO120204
5 Piston Pin and Retainer EVO120213
6 Cranksaft EVO120210
7 Cylinder Head EVO120103
8 Cylinder Head Shim (2pcs) EVO120112
9 Drive Washer EVO110219
10 Spacer Washer EVO100219B
11 Carburetor Retainer EVO061129
12 Prop Washer EVO110220
13 5/16 x 24 Prop Nut EVO91221
14 Gasket Set, Engine EVO120416
15 Front Bearing EVO110109
16 Rear Bearing EVO061110
17 Screw Set, Engine EVO100901
19 Complete Carburetor EVO110801
20 Muffler Assembly EVO110601
21 Muffler Mounting Screw Set with Gasket EVO110E100A
22 Carburetor Body and Spray Bar EVO110863
23 Nipple and Gasket EVO061819
24 High Speed Needle Valve EVO120829A*
25 Spray Bar Bracket (Remote) EVO120870
26 High Speed Needle Valve Ratchet EVO100833
27 Collar with 3mm Setscrew EVO100834A
28 Spraybar, Remote EVO100830
29 Carburetor Barrel EVO110813
30 Throttle Rotor Spring EVO100814A
31 Low Speed Needle Valve EVO110844A
32 Throttle Arm EVO100864A
33 Needle Limit Collar EVO100850A
34 Piston and Pin EVO120214R
35 Idle Stop Screw EVO100825F
36 Carburetor Gasket/O-Ring Set EVO061E61C
37 Small Parts Set Carburetor EVO120E120C
38 Needle Valve Assembly EVO120874F
39 Drive Key EVO110218
40 Sleeve Index Pin EVO400160
41 Piston Ring EVO120236
7
8, 14
17
41
5
4
40 1
36
37
36
12 915
10
6 2, 14 217 17
17
21
11
16
21
19
21
20
23
36
25
23 37
25
36
28 26 38
35
23
30
29
36
31
27 24
33
32
39
22
13
3
34
* The 1.20NX HS needle valve is designed specifically for the 1.20NX only.

Warranty Period
Exclusive Warranty- Horizon Hobby, Inc., (Horizon)
warranties that the Products purchased (the “Product”)
will be free from defects in materials and workmanship
for a period of 2 years from the date of purchase by the
Purchaser.
Limited Warranty
(a) This warranty is limited to the original Purchaser
(“Purchaser”) and is not transferable. REPAIR OR
REPLACEMENT AS PROVIDED UNDER THIS WARRANTY
IS THE EXCLUSIVE REMEDY OF THE PURCHASER. This
warranty covers only those Products purchased from
an authorized Horizon dealer. Third party transactions
are not covered by this warranty. Proof of purchase is
required for warranty claims. Further, Horizon reserves
the right to change or modify this warranty without
notice and disclaims all other warranties, express or
implied.
(b) Limitations- HORIZON MAKES NO WARRANTY OR
REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE OF THE PRODUCT. THE
PURCHASER ACKNOWLEDGES THAT THEY ALONE HAVE
DETERMINED THAT THE PRODUCT WILL SUITABLY MEET
THE REQUIREMENTS OF THE PURCHASER’S INTENDED
USE.
(c) Purchaser Remedy- Horizon’s sole obligation
hereunder shall be that Horizon will, at its option, (i)
repair or (ii) replace, any Product determined by Horizon
to be defective. In the event of a defect, these are the
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right to inspect any and all equipment involved in a
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at the sole discretion of Horizon. This warranty does
not cover cosmetic damage or damage due to acts of
God, accident, misuse, abuse, negligence, commercial
use, or modification of or to any part of the Product.
This warranty does not cover damage due to improper
installation, operation, maintenance, or attempted
repair by anyone other than Horizon. Return of any goods
by Purchaser must be approved in writing by Horizon
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HORIZON SHALL NOT BE LIABLE FOR SPECIAL,
INDIRECT OR CONSEQUENTIAL DAMAGES, LOSS OF
PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN
ANY WAY CONNECTED WITH THE PRODUCT, WHETHER
SUCH CLAIM IS BASED IN CONTRACT, WARRANTY,
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Horizon has no control over use, setup, final assembly,
modification or misuse, no liability shall be assumed
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the act of use, setup or assembly, the user accepts all
resulting liability.
If you as the Purchaser or user are not prepared
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this Product, you are advised to return this Product
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Law: These Terms are governed by Illinois law (without
regard to conflict of law principals).
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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
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children without direct adult supervision. The Product
manual contains instructions for safety, operation
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Questions, Assistance, and Repairs
Your local hobby store and/or place of purchase
cannot provide warranty support or repair. Once
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you must contact Horizon directly. This will enable
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For questions or assistance, please direct your
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should be shipped to the following address:
Horizon Hobby UK
Units 1-4 Ployters Rd
Staple Tye
Harlow, Essex
CM18 7NS
United Kingdom
Please call [phone] or e-mail us at
[e-mail] with any questions or
concerns regarding this product or warranty.
Germany
Electronics and engines requiring inspection or repair
should be shipped to the following address:
Horizon Technischer Service
Hamburger Strasse 10
25335 Elmshorn
Germany
Please call [phone] or e-mail us at
[e-mail] with any questions or
concerns regarding this product or warranty.
1514
Warranty Information