Congratulations on your purchase of REV Gasoline Engine
Safety Precautions
This engine is for experienced flyers only and could cause serious harm if used incorrectly. Always use care when running
large gas engines.
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Read this manual in its entirety before commencing use of this engine.
This engine is specifically designed for use on a radio controlled model plane. If it is used for any other purpose, we cannot be
held responsible for its reliability or safety.
Check the propeller prior to each use and replace if damaged.
Always mix fuel in a well ventilated space.
Never operate this motor or fly alone
Keep clear of the prop while motor is running.
Engine can draw any loose items into propeller. Do not run engine near loose debris, dust, loose clothing or long hair
Any one in the immediate area should wear safety specs while motor is running
Never stand in front or to the side of propeller while motor is running. Always stand behind
Always install ignition kill switch for emergency use
Check propeller is secure before each start
Ensure idle stop screw is adjusted to allow engine to stop when carburetor is fully closed
Ensure spinner cone does not touch the propeller
Never operate engine indoors or in a confined space
Keep immediate area clear of spectators
Gasoline is extremely flammable. Always allow engine to cool before refueling and keep fuel away from other ignition sources
Always perform Radio range check before flying with engine running. If glitches are noticed, do not fly. Check spark plug lead
for holes or nicks and check there is no vibrating metal to metal connections
Mounting the engine
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Make certain the engine is mounted on aircraft grade plywood firewall with a thickness of at least 6mm and is firmly bolted
using all four mounts. Large flat washers are recommended on the back side to prevent crushing of plywood.
We recommend blue Loctite on all bolt connections to prevent any bolts coming loose during flight. Regularly check all
connections to insure their integrity.
Be careful using shims or spacers behind mounting brackets and always make sure the firewall connections are flat so as to
not put a twisting load on the crankcase.
Ensure the carburetor has plenty of clearance, allowing plenty of airflow to achieve good aspiration
This carburetor is spring loaded to idle/cut off in case of throttle linkage or servo failure. As a personal preference this can
be disengaged if desired but it is not recommended for safety reasons
Soft mounts may be used but beware that excessive movement can cause problems with throttle linkages and cowl
penetrations
The throttle arm should be fitted with a ball link to pushrod to prevent any vibration. Do not use any metal to metal
connections that may vibrate and cause radio interference (RF noises).
The choke can be operated manually or by mini servo.
As this engine has a pumped carburetor the position and height of the fuel tank can be freely selected. The tank will
need to be vented but no back pressure is required from the exhaust system.
Make sure engine and firewall are secured.
Make sure you measure, align and drill the firewall with the correct bolt pattern. Misalignment of the bolt pattern will
put undue stress on the mounting tabs which may cause them to crack during normal operation.
Setting up ignition
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When setting up the ignition system, do not use light gauge wire for supply to ignition module.
The ignition runs on a standard 4.8-6V battery pack. We recommend using a 900mah pack as a minimum. Higher
voltage packs (such as 7.4V LiPo) can be used ONLY with a reliable voltage regulator of 6V or lower.
We recommend using a high quality heavy duty radio switch for ignition.
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The ignition unit should be mounted away from excessive heat and firmly held with cable ties or Velcro straps.
Be sure to use foam between the airframe and ignition box to prevent vibration damage.
Do not let the shielded plug wires rub against sharp objects or edges as this could damage the wire and allow radio
noise out causing interference.
Make sure the spark plug cap is fitted properly and firmly to the spark plug before flying the model.
Isolate all ignition components as far as possible from all other electrical components.
Always perform radio range check before flying with the engine running.
Starting and operating
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Fill the fuel tank and turn on ignition.
Close the choke and open the throttle to the full open position.
Quickly flip the propeller in the counterclockwise direction. When flipped several times, the engine will momentarily fire
and a popping sound of initial ignition is heard. We recommend using a leather glove.
Open the choke and set the throttle at the idle position and flip the propeller. This should start the engine.
Let the motor warm up for a few seconds before advancing the throttle.
WARNING: THE ENGINE MAY START ON ANY FLIP OF THE PROPELLEOR WHETHER IGNITION IS ON OR OFF!
Be sure to lower throttle to idle position once choke is removed to avoid hard kickback when starting.
Always have aircraft restrained adequately during this process.
Breaking in the engine
Be sure to use only high quality petroleum-based oil (32:1 mix ratio) for break-in.
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Use a 32:1 ratio Pennzoil or Lawnboy Ashless petroleum-based air cooled oil.
Start engine and allow it to idle (2000-2500rpm).
The engine will run rough during break-in.
Allow engine to run like this for 30 minutes refilling fuel if required.
After 30 minutes switch off engine and allow it to cool right down by itself.
Repeat until you have run 4-5 gallons of fuel through the engine. This assures success with your REV engine.
Carburetor adjustment
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The needle farthest from the cylinder is the “high end” needle while the closest to the cylinder is the “low end” needle
(see the L and H letters engraved on the carburetor). Winding the needle clockwise will lean the engine and anti clockwise
will richen the engine.
The setting will vary with altitude, temperature, humidity etc. A general starting point is 1.5 turns open on the low end
and 1.5-2 turns open on the high end.
Adjusting either needle may have some effect on the other, so some re-adjustment may be necessary when tuning.
Adjust high end needle at full throttle to peak RPM, then richen slightly to ensure engine is not running too lean in flight
which may cause the engine to quit in flight.
Adjust low end needle to achieve a smooth idle and reliable transition to high throttle.
Set the high end needle slightly rich during break-in period.
Further adjusting may be necessary once cowl is placed as this often changes air pressure around carburetor intake
Maintenance
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Use 87-91 Octane unleaded gasoline/petrol mixed with high quality 2 stroke synthetic oil. We recommend the Amsoil Sabre
synthetic oil at a mix ratio of 50:1.
Never use alcohol or similar based fuels.
Avoid running engine at low speeds for long periods as spark plug may become carbonized.
Regularly check fuel tubing to make sure there are no leaks.
The carburetor fuel screen should be cleaned periodically. Carefully remove the pump cover, gasket and pump membrane.
The screen will be visible and can be cleaned after careful removal.
Use a fuel filter between your fuel container and the plane’s fuel tank while refueling. We also strongly recommend using a
high quality fuel filter between the plane’s tank and carburetor.
Verify the balance of your propeller and check for any damage or chipped tip. Damaged propeller must be replaced!
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Trouble shooting
Engine won’t start:
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Engine could be flooded (the REV engine only needs to use choke for the first start of the day).
Low battery voltage.
Check tank venting, clunk position, fuel flow.
Check fuel lines for kinks, holes or damage.
Check fuel flow while flipping.
Check throttle is open.
Ensure prop is flipped over with authority.
Verify ignition switch is ON.
Motor runs poorly:
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Engine could be too rich. Ensure both needles are adjusted correctly.
Ensure carburetor has not become loose, causing air leakage.
Check all ignition connections and switches.
Ensure fuel is freshly mixed and is free of humidity and water.
Ensure spark plug is tightened firmly
Warranty
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Your REV engine is covered with a two year warranty from the initial date of purchase for defects in workmanship or materials.
Ignition unit warranty - please refer to our website www.RevEngines.com
Any modifications to, or disassembly of engine or ignition will void warranty of that item
Replacement items will not be shipped until defective items are received by Precision Aerobatics and confirmed to be defective.
This warranty does not cover:
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Shipping damage incurred from shipping to and from Precision Aerobatics.
Shipping charges, for warranty service, to and from Precision Aerobatics.
Damage caused by improper handling, operation, maintenance, modifications, fuel, oil, fuel additives or crash.
Disassembly and/or modifications of the engine or ignition unit will void warranty!
Specifications
Specifications
REV 55
REV 28
Capacity:
55CC
28CC
Configuration:
2 stroke single cylinder air cooled
2 stroke single cylinder air cooled
Carburettor:
Walbro vacuum pump
Walbro vacuum pump
Ignition:
RCEXL ignition system (CDI)
RCEXL ignition system (CDI)
Power supply:
4.8V – 6V battery pack
4.8V – 6V battery pack
Weight:
1,406g engine, 120g ignition, 92g muffler
907g engine, 120g ignition, 62g muffler
Maximum rpm:
Idle rpm:
Gasoline/Petrol:
Propeller selection:
9,000 RPM
9,000 RPM
Approx 1200-1300 RPM
Approx 1200-1300 RPM
Pre-mixed 87-91 Octane unleaded mixed with
Pre-mixed 87-91 Octane unleaded mixed with
high quality 2 stroke synthetic oil
high quality 2 stroke synthetic oil
Break-in: Vox 22x8 laminated wood
Break-in: Vox 18x6 laminated wood
After break-in: Vox 22x8, 22x10, 23x8, 23x10,
After break-in: Vox 18x6, 18x8, 18x10, 19x6,
24x8 laminated wood or Carbon
19x8 laminated wood or Carbon
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Optional accessories available from PrecisionAerobatics.com
High quality fuel line
Item code: AC-1619
Available in two inside diameters 1/8” and 3/16”. 1/8” is suitable for up to 100cc. 3/16” is for larger engines. Made in the
USA. Specially formulated it is superior to Tygon. Super flexible, it is suitable for Gasoline, Kerosene and Smoke Oils. Buy
any length you need (sold per foot).
Top quality CNC machined fuel filler (fuel dot)
item code: AC-1632
This is a beautiful super lightweight, affordable scale looking filler. Bolts, O ring and CNC machined back plate are
included. Simply drill a hole in your fuselage to complete the installation on any giant scale airplane.
Precision CNC machined fuel filter
item code: AC-1868
This beautifully CNC machined, fuel/smoke filter is smartly designed to protect your large engine. Made for high volume
the filter is suitable for both gas and glow fuels as well as smoke oils. Using O ring it provides perfect seal to prevent any
kind of leeks. Can be easily opened and cleaned. Made for PA in Germany
Vox gas propellers
Made of laminated hardwood for added stability and strength. Designed for gas engines operation they feature heat and
distortion resistance, low air friction (meaning they are relatively quiet) and greater thrust. Their accurate machining
guarantees accurate flight performance - making them a perfect choice for IMAC and precision aerobatics.
See www.Voxprops.com for more information.
Vox Gas Prop quiver bag
item code: AC-2159
Vox propellers offer a high quality double padded propeller quiver bag, made of strong durable
canvas on the outside and smooth fabric on the inside. The Vox quiver bag is closed from all sides
so the propellers cannot slip out by mistake, yet you can easily insert and remove them. The bag
holds 4 propellers up to 33” in length.
Propeller protection bag
item code: AC-2153 & AC-2152
Double foam and thick canvas protect your carbon or wooden propeller (and protect you and the surrounding from the
prop).
Available in two sizes
27" - 34" propellers item code: AC-2153
22-26" propellers item code: AC-2152
30-35% feather-weight helmet pilot
item code: AC-1843
Complete your airplane with PA realistic helmet pilot figure. Made of fiberglass and pre-painted with high glossy finish, it is
incredibly lightweight.
Installation is extremely simple and you can choose to have the pilot removable using the provided hardware or fixed to your
cockpit. Can be used in 30% airplanes with a little cut to the shoulders or in a 35% as it is.
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