.46NX Evolution®
Engine
USER GUIDE
© 2008 Manufactured exclusively for Horizon Hobby, Inc. 877-504-0233
www.horizonhobby.com
12955
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 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.
This user’s guide is intended to provide the basic
information needed to operate and maintain your
Evolution NX 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 shop or flying club can put you in touch
with an experienced pilot in your area.
Glow Plug
Muffler Nipple
Muffler
Fuel Nipple
Mounting the Engine
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.
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.
Installing the Muffler
Attach the linkage to the throttle arm.
Throttle Linkage
A clevis is recommended for attaching the throttle
Muffler
Glow Plug
High-Speed Needle
Low-Speed Needle
Throttle Arm
The muffler mounting accessory package includes mounting screws
(2), lock washers (2), muffler gaskets (2) and an L- wrench.
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.
2
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
Fuel Line
Vent Line
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
1 mm
At low throttle, mid-trim, the throttle barrel should be 1 mm 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,
low-trim should completely close the throttle barrel.
Reverse the servo throw if necessary.
Vent Line
Fuel Line
Using medium silicon 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.
Securely tighten the prop nut using an adjustable 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 an adjustable
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 clock-wise
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.
4
The Hangar 9 START KIT (HANSTART) includes everything needed,
except fuel and starter, to get the Evolution Engine running.
5
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.
Needle Limiters
The high- and low-speed needles have limiters that
prevent 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 above right.
Step 1. High-Speed Needle Adjustment
With the engine running, advance the throttle
to full throttle while a helper securely holds your
Low-Speed Needle AdjustmentHigh-Speed Needle Adjustment
Note that the needle adjustment range is limited, preventing adjustment beyond the practical range.
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 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.
Step 2. Low-Speed Needle Adjustment, cont.
4. The 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.
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, altitude 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.
High-Speed SetRight Needle Valve Correction
Should the high-speed SetRight needle valve
need to be adjusted outside of the factoryestablished parameters, simply pull out the
detent spring on the high-speed needle
assembly and move the needle valve in the
desired direction so the SetRight pin passes
the spring detent. You now have re-established
a new range for your purposes. You can also
loosen the setscrew on the collar holding the
detent spring and rotate this in the
desired direction.
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.
Low-Speed SetRight Needle Valve Correction, cont.
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.
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
76
gallon jug. Many pilots will invest in 1/2 gallon or quartsize 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 insuring 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 element (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
we 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.
NX Evolution Engines Specifications
Disp Bore Stroke Weight Crank K
Items (c.i.) (mm) (mm) (oz) (ISO) Cylinder Propeller
EVOE0461 .467" .864" .797" 13.76 1/4X28 ABC 11X6
F
H
A
B
C
Dimensions (mm) A B C D E F G H
EVOE0461 36 44 17.5 52.5 90.5 108 1/4X28 37
D
Troubleshooting Guide
Engine Won’t Fire
•Glowstarternotcharged
- Charge glow starter
•Glowplugburntout
- Replace glow plug
•Nofuelisgettingtothecarburetor
- Check tank, fuel lines reversed
•Thestarterisreversed
- Reverse the polarity on the starter cables
Engine Quits Repeatedly
•Needlesneedadjusting
- See adjustment procedure
•Badoroldfuel
- Replace with fresh fuel
•Wornoutglowplug
- Replace with new EVOGP1 glow plug
Engine Runs Inconsistently
•Holeinfuelline
- Replace fuel line
•Badoroldfuel
- Replace with fresh fuel
After each flying session:
1. Fully drain the fuel from the tank.
2. Start the engine and run it until the fuel is
3. Try starting the engine three more times or until
If the engine will not be used within 10 days, 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.
If you need additional help or have any questions, please call
Horizon’s Service Center. Horizon has trained technicians who
are qualified to answer your engine questions.
G
E = height
F = length
G = crankshaft thread size
H = muffler bolt spacing
Maintenance
completely run out of the engine.
it will no longer fire. This gets all the fuel out of
the engine.
Evolution/Horizon Service Center
4105 Fieldstone Road
Champaign, IL 61822
877-504-0233
98
Cross-Reference of Evolution .46 NX Part Numbers
No. Description
1 Crankcase EVO046101
2
Rear Cover w/Gasket EVO100E46D
3
Piston & Liner Set (ABC) EVO046203
4
Connecting Rod Set (Dual Bushing) EVO100204
5
Wrist Pin w/Clips (Teflon) EVO040213
6
Crankshaft EVO046210
7
Head Clamp EVO046103B
8
Cylinder Head Shim EVO040112
9
Prop Driver EVO040219
10
Spacer Washer EVO100219B
11
Carburetor Retainer (Drawbar) EVO100129
12
Prop Washer EVO100220
13
Prop Nut EVO100221
14
Gasket Set, Engine EVO100416
15
Ball Bearing, Front (Rubber seal) EVO100109
16
Ball Bearing, Rear (Open Race) EVO100110
17
Screw Set, Engine EVO100901
18
Flywheel (Evolution) N/A
19
Carburetor Complete EVO100801A
20
Muffler EVO100601
21
Muffl er Mounting Screw Set w/Gasket EVO100E46A
22
Carburetor Body (w/Spraybar) EVO100863
Fuel Nipple & Gasket EVO100114
23
24
High-Speed Needle Valve EVO100829A
25
Spraybar Bracket (Remote) EVO100870A
26
High-Speed Needle Valve Ratchet EVO100833
27
Collar w/Setscrew EVO100834A
28
Spraybar, Remote EVO100830
29
Throttle Barrel EVO100813
30
Spring, Throttle Barrel EVO100814A
31
Idle Needle EVO100844A
32
Throttle Arm EVO100864A
33
Idle Needle Limit Collar EVO100850A
34
45mm Fuel Tube EVO100878A
35
Idle Stop Screw w/Nut EVO100825F
36
Carburetor Gasket/O-Ring Set EVO100E46B
37
Small Parts Set, Carburetor EVO100E46C
38
Needle Valve Assembly EVO046874A
39
Drive Key N/A
40
Sleeve Index Pin N/A
41
Propeller Washer & Nut Set EVO040228
42
Carburetor w/Remote NV Assembly N/A
43
Head Button EVO046128
No. Description
1 Crankcase
2 Rear Cover with Gasket
3 Piston & Liner Set (ABC)
4 Connecting Rod (Dual Bushing)
5 Wrist Pin w/Clips (Teflon)
6 Crankshaft (1/4 X 28)
7 Head Clamp
8 Cylinder Head Shim
9 Prop Driver
10 Spacer Washer
11 Carburetor Retainer (Drawbar)
12 Prop Washer
13 Prop Nut (1/4 X 28)
14 Gasket Set, Engine
15 Ball Bearing, Front (Rubber Seal)
16 Ball Bearing, Rear (Open Race)
17 Screw Set, Engine
18 Flywheel (Evo-Alpha)
19 Carburetor, Complete
10
20 Muffler
21 Muffler Mounting Screwset
22 Carburetor Body
23 Fuel Nipple
24 High-Speed Needle Valve
25 Spraybar Bracket (Remote)
26 High-Speed Needle Valve Ratchet
27 Collar w/Setscrew
28 Spraybar (Remote)
29 Throttle Barrel
30 Throttle Barrel Spring
31 Idle Needle
32 Throttle Arm
33 Idle Needle Limit Collar
34 45mm Fuel Tube
35 Idle Needle Stop Screw w/Nut
36 Carburetor Gasket, O-Ring Set
37 Small Parts Set, Carburetor
38 Needle Valve Assembly
43 Head Button
11
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 Purchaser’s exclusive remedies. Horizon
reserves the right to inspect any and all equipment
involved in a warranty claim. Repair or replacement
decisions are 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 before shipment.
Damage Limits
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,
NEGLIGENCE, OR STRICT LIABILITY. Further, in no event
shall the liability of Horizon exceed the individual
price of the Product on which liability is asserted. As
Horizon has no control over use, setup, final assembly,
modification or misuse, no liability shall be assumed
nor accepted for any resulting damage or injury. By
the act of use, setup or assembly, the user accepts all
resulting liability.
If you as the Purchaser or user are not prepared
to accept the liability associated with the use of
this Product, you are advised to return this Product
immediately in new and unused condition to the place
of purchase.
LAW: These Terms are governed by Illinois law (without
regard to conflict of law principals).
Safety Precautions
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. The Product
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 injury.
Questions, Assistance, and Repairs
Your local hobby store and/or place of purchase cannot
provide warranty support or repair. Once assembly,
setup or use of the Product has been started, you
must contact Horizon directly. This will enable Horizon
to better answer your questions and service you in
the event that you may need any assistance. For
questions or assistance, please direct your email
to productsupport@horizonhobby.com, or call
877.504.0233 toll free to speak to a service technician.
Inspection or Repairs
If this Product needs to be inspected or repaired,
please call for a Return Merchandise Authorization
(RMA). Pack the Product securely using a shipping
carton. Please note that original boxes may be
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carrier that provides tracking and insurance for lost
or damaged parcels, as Horizon is not responsible for
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your complete name, street address, email address
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business days, your RMA number, a list of the included
items, method of payment for any non-warranty
expenses and a brief summary of the problem. Your
original sales receipt must also be included for
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the shipping carton.
Warranty Inspection and Repairs
TO RECEIVE WARRANTY SERVICE, YOU MUST INCLUDE
YOUR ORIGINAL SALES RECEIPT verifying the proofof-purchase date. Provided warranty conditions have
been met, your Product will be repaired or replaced free
of charge. Repair or replacement decisions are at the
sole discretion of Horizon Hobby.
Non-Warranty Repairs
SHOULD YOUR REPAIR NOT BE COVERED BY
WARRANTY, THE REPAIR WILL BE COMPLETED AND
PAYMENT WILL BE REQUIRED WITHOUT NOTIFICATION
OR ESTIMATE OF THE EXPENSE UNLESS THE EXPENSE
EXCEEDS 50% OF THE RETAIL PURCHASE COST. By
submitting the item for repair you are agreeing to
payment of the repair without notification. Repair
estimates are available upon request. You must
include this request with your repair. Non-warranty
repair estimates will be billed a minimum of ½ hour
of labor. In addition you will be billed for return freight.
Please advise us of your preferred method of payment.
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as well as Visa, MasterCard, American Express, and
Discover cards. If you choose to pay by credit card,
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will be considered abandoned and will be disposed of
accordingly. PLEASE NOTE: NON-WARRANTY REPAIR
IS ONLY AVAILABLE ON ELECTRONICS AND MODEL
ENGINES.
Electronics and engines requiring inspection or repair
should be shipped to the following address:
Horizon Service Center
4105 Fieldstone Road
Champaign, Illinois 61822
All other Products requiring warranty inspection or
repair should be shipped to the following address:
Horizon Product Support
4105 Fieldstone Road
Champaign, Illinois 61822
PLEASE CALL 877-504-0233 WITH ANY QUESTIONS
OR CONCERNS REGARDING THIS PRODUCT OR
WARRANTY.
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