Evolution 35GT2 (2.15) Gas Engine

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MSRP Price: $799.99
Item#: EVOE35GT2
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The 35GT2 comes equipped with Evolution’s advanced GT2 Ignition System. The GT2 Ignition System can be powered by a Li-Po battery pack without the need for a regulator. It also includes an optional, remotely-mounted LED tach as well as timing software that can be programmed for muffler or tuned pipe
exhaust systems.

The 35GT2 is well suited to 1.50- to 1.80-size planes like Hangar 9's big, beautiful P-47D Thunderbolt 150 and P-51D Mustang 150.

  • Easy conventional mounting with existing motor mounts
  • Easy-to-start electronic ignition
  • Superior porting
  • Specially engineered for ease
  • Preset Walbro carburetor
  • Same no-fuss reliability as Evolution's glow engines
  • Includes everything needed for installation


Type: 2-stroke Gasoline
Displacement: 2.15 cu in (34.60 cc)
Bore: 1.44 in (35.50 mm)
Stroke: 1.38 in (35.20 mm)
Cylinders: Single
Engine (Only) Weight: 1493 g (52.8 oz)
Crankshaft Threads: M 10x1mm
Benchmark Prop: 19x8 @ 8,200
Prop Range: 18x8 - 21x10
RPM Range: 1,400 - 9,000
Fuel: Gas/Oil mix 40:1
Mounting Dimensions: 182 x 84 x 118 mm
HP: 4.1 PS @ 8,500 rpm
Cylinder Type: Ring
Carb Type: Walbro 2-Needle WT561
Crank Type: Ball Bearing


It has come to our attention that some users are not aware that when using the GT2/GX2 electronic ignition that it fires the spark plugs for 1 second to clear any unwanted oil or drainage from the spark plug prior to starting the engine. If the engine is in the compression position (i.e. the piston is above the exhaust port in either the up or down part of the stroke) any compressed fumes may ignite causing the propeller to turn and possibly the engine to start un-intentionally..

To prevent this with the Evolution Gasoline GX2, GT2 Ignition System the Ignition Power Switch must be turned off, check to see that the piston is in the bottom dead center (BDC) position. (Bottom Dead Center can be found by rotating the propeller through the compression stroke. As you rotate the propeller you will feel it tighten, then suddenly loosen. Once the turn becomes very easy you have completed the compression stroke and are at Bottom Dead Center.)

Once you are sure the piston is in this position you may then turn on the ignition power switch and operate the system safely.

As always it is important to use extreme care when near or with engines, fuel and propellers. Please use caution when working with these components.

If you have any questions or concerns please contact our Product Support team at 1-877-504-0233 or

Recent tests have shown that the new Evolution Engines GT2 and GX2 ignition systems require a minimum of 6.4 volts for proper operation.  Subsequently, it is necessary to use either a 6-cell, 7.2-volt Ni-Cd/Ni-MH battery or a 2-cell, 7.4-volt Li-Po (lithium-polymer) battery as the power source for these ignitions.  Capacity ratings of 1200mAh are sufficient for a day’s flying time.

 When the battery voltage drops below 6.4 volts, the ignition will not allow the engine to restart.  This battery requirement applies to 26GT2, 45GX2 and 58GX2 engines having the new ignition and has now been incorporated into the instruction manuals for these engines.



1 Authorized Warranty Period (Two Year)

What this Warranty Covers:
Horizon Hobby, Inc., (Horizon) warrants to the original purchaser that the product purchased (the "Product") will be free from defects in materials and workmanship for a period of 2 years from the date of purchase.

2 Authorized Limited Warranty & Limits of Liability International

What is Not Covered
This warranty is not transferable and does not cover (i) cosmetic damage, (ii) damage due to acts of God, accident, misuse, abuse, negligence, commercial use, or due to improper use, installation, operation or maintenance, (iii) modification of or to any part of the Product, (iv) attempted service by anyone other than a Horizon Hobby authorized service center, (v) Product not purchased from an authorized Horizon dealer, or (vi) Product not compliant with applicable technical regulations.


Purchaser’s Remedy
Horizon’s sole obligation and purchaser’s sole and exclusive remedy shall be that Horizon will, at its option, either (i) service, or (ii) replace, any Product determined by Horizon to be defective. Horizon reserves the right to inspect any and all Product(s) involved in a warranty claim. Service or replacement decisions are at the sole discretion of Horizon. Proof of purchase is required for all warranty claims. SERVICE OR REPLACEMENT AS PROVIDED UNDER THIS WARRANTY IS THE PURCHASER’S SOLE AND EXCLUSIVE REMEDY.

Limitation of Liability
HORIZON SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY, REGARDLESS OF WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, TORT, NEGLIGENCE, STRICT LIABILITY OR ANY OTHER THEORY OF LIABILITY, EVEN IF HORIZON HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 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 the Product, purchaser is advised to return the Product immediately in new and unused condition to the place of purchase.

These terms are governed by Illinois law (without regard to conflict of law principals). This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Horizon reserves the right to change or modify this warranty at any time without notice.


Questions, Assistance, and Services
Your local hobby store and/or place of purchase cannot provide warranty support or service. Once assembly, setup or use of the Product has been started, you must contact your local distributor or 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 visit our website at, submit a Product Support Inquiry, or call 877.504.0233 toll free to speak to a Product Support representative.

Inspection or Services
If this Product needs to be inspected or serviced and is compliant in the country you live and use the Product in, please use the Horizon Online Service Request submission process found on our website or call Horizon to obtain a Return Merchandise Authorization (RMA) number. Pack the Product securely using a shipping carton. Please note that original boxes may be included, but are not designed to withstand the rigors of shipping without additional protection. Ship via a carrier that provides tracking and insurance for lost or damaged parcels, as Horizon is not responsible for merchandise until it arrives and is accepted at our facility. An Online Service Request is available at If you do not have internet access, please contact Horizon Product Support to obtain a RMA number along with instructions for submitting your product for service. When calling Horizon, you will be asked to provide your complete name, street address, email address and phone number where you can be reached during business hours. When sending product into Horizon, please include your RMA number, a list of the included items, and a brief summary of the problem. A copy of your original sales receipt must be included for warranty consideration. Be sure your name, address, and RMA number are clearly written on the outside of the shipping carton.
NOTICE: Do not ship LiPo batteries to Horizon. If you have any issue with a LiPo battery, please contact the appropriate Horizon Product Support office.

Warranty Requirements
For Warranty consideration, you must include your original sales receipt verifying the proof-of-purchase date. Provided warranty conditions have been met, your Product will be serviced or replaced free of charge. Service or replacement decisions are at the sole discretion of Horizon.

Non-Warranty Service
Should your service not be covered by warranty, service 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 service you are agreeing to payment of the service without notification. Service estimates are available upon request. You must include this request with your item submitted for service. Non-warranty service estimates will be billed a minimum of ½ hour of labor. In addition you will be billed for return freight. Horizon accepts money orders and cashier’s checks, as well as Visa, MasterCard, American Express, and Discover cards. By submitting any item to Horizon for service, you are agreeing to Horizon’s Terms and Conditions found on our website

ATTENTION: Horizon service is limited to Product compliant in the country of use and ownership. If received, a non-compliant Product will not be serviced. Further, the sender will be responsible for arranging return shipment of the un-serviced Product, through a carrier of the sender’s choice and at the sender’s expense. Horizon will hold non-compliant Product for a period of 60 days from notification, after which it will be discarded.

United States:
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 or e-mail us at with any questions or concerns regarding this product or warranty.

United Kingdom:
Electronics and engines requiring inspection or repair should be shipped to the following address:

Horizon Hobby Limited 
Units 1-4 Ployters Rd
Staple Tye
Harlow, Essex
CM18 7NS
United Kingdom

Please call +44 (0) 1279 641 097 or e-mail us at with any questions or concerns regarding this product or warranty.

Electronics and engines requiring inspection or repair should be shipped to the following address:

Horizon Technischer Service
Christian-Junge-Strasse 1
25337 Elmshorn

Please call +(0) 49 4121 2655 100 or e-mail us at with any questions or concerns regarding this product or warranty.

Electronics and engines requiring inspection or repair should be shipped to the following address:

Horizon Hobby SAS
11 Rue Georges Charpak

Please call +33 (0) 1 60 18 34 90 or e-mail us at with any questions or concerns regarding this product or warranty.

China:                                                                                           Electronics and engines requiring inspection or repair should be shipped to the following address:

Horizon Hobby – China
Room 506, No. 97 Changshou Rd.
Shanghai, China 200060

Please call +86 (021) 5180 9868 or email us at with any questions or concerns regarding this product or warranty.



Modified: 11/13/2012

Team Tips

Some early notes about test flying the Evolution Gas 35GT engine

With the introduction of the new Evolution Gas Power 35GT (and close relative the 26GT) have come many inquires about just how well the engine performs. The short answer is very nice, very nice indeed.

This engine is attractive with its blue anodized head and thrust washer but performance is the real story. The electronic ignition and conventional “model airplane engine” configuration make for easy mounting in existing models and minimal weight gain over a glow engine. I mounted it in one of our pre-production Extra 260 27%-size aerobatic models in order to get an idea of how it would perform as a typical sport flyer’s fun to fly airplane.

It was easy to mount the engine with the mounts included in the kit. A Bisson inverted wraparound Pitts style muffler was installed with plenty of room all around and only two screws to hold it together. The standard fuel tank supplied with the model proved to have plenty of capacity for 15 to 20 minute flights. The servos in this model just happened to end up being JR 9411 digital precision servos. Overall it is a very nice and easy assembly with minimal cutting of the cowl. Balance proved to be a bit tail heavy and the batteries (receiver and ignition) were relocated to bring the model in line with the manuals recommendations. By the way, flight tests were accomplished using the new JR NiMH receiver packs for both the radio and the ignition. This electronic ignition requires a 4 cell 4.8 volt pack and I choose the 2300mah (JRPB5001) pack. I have not been able to use even 30% of the battery capacity in a days flying.

Firing up the Evolution engine was a fun experience. No changes were made to the basic settings of the carb. The 35GT has a “Fast idle/Choke on” startup position on the carb so simply putting the choke “on” will have the idle in the best starting position. Before turning on the ignition it is wise to give the prop a few flips to get fuel to the carb (the Walbro carb has a built in pump/regulator). When powering up the ignition you will note that the LED will give you a bright red flash to indicate the power is on. After a few flips the engine was running. I followed the manual instructions for an initial minor breakin. This few minutes of ground running can be accomplished in the model at the field before the first flight. The startup indicated the engine was a little on the rich side but no changes were made until after the first flight.

I had selected a 20x8 Air Wild propeller for the first flights with this model. Performance in the air was acceptable but this proved to be a bit larger prop than optimum for the Extra 260. When the APC 19x8 was fitted and the carb tuned this baby came alive! The airplane has good power for 3D hover maneuvers as well as the more common aerobatic sequences. It certainly is not the hot rod that the bigger 50cc engines prove to be in these lightweight models but it is very nice to fly. Still, level flight is pretty fast with full throttle so throttle management during maneuvers is important.

The engine has been exceptionally reliable in this model to the extent that only one engine off landing was made…totally empty fuel tank! It is pretty easy to lose your sense of flight time when you are having this much fun with a combination like this. Now I flip the stopwatch switch on the JR transmitter at the beginning of every flight.

RPM with the 19x8 propeller is 8000 plus. This seems to be right in the middle of the operational “sweet spot” for this engine. I also used a Pro Zinger 20x6 turning 8600 rpm with moderate results, great low speed pull but not enough top end speed for this model. I also note that propeller speed has been increasing with more run-time on the engine. I suspect that power improves as the ring becomes fully seated.

All in all, everyone that has flown this combination has been satisfied and smiling after they land. It is great fun and the engine just becomes sort of a best friend, always ready to fly and no special equipment or procedures required. When you pick this engine as your first Gas Powered engine you are going to have a very enjoyable experience!