AvioMac 125cc TWIN User manual

INSTRUCTION MANUAL AND ENGINE

WARRANTY.

125cc TWIN (IDM)

CODE: AV125B2B

WWW.AVIOMAC.COM AVIOMAC 125 TWIN (IDM)

IMPORTANT!

Thank you for purchasing one Aviomac

125cc, one of the best gasoline engine

available. With our 3-year warranty on

manufacturing defects and costumer

support, we are sure that you will be glad

with this engine.

For customer who have had gasoline

engines before some information may not

be new, but we recommend you to follow

our instructionsto have a safe and good

running engine for a long time.

Warning: Before starting attempt the

engine read the instruction manual

completely.

•This is not a toy, it is a high-quality,

powerful engine and it is safe, if it

is used properly.

•Make sure that when you start the

engine you are not wearing loose

clothing or you are not using things

that could catch the propellers or

the engine.

•Make sure that all people are

beyond the engine and out of the

propeller line.

•This engine was designed for

modelling aircraft, so do not use it

for other purpose.

•Do not start the engine if it is not

kept.

•It is important to use always

original spare parts and high-

quality accessories.

•We recommend you to install an

external switch and a servo

operated kill switch (not included).

•Do not pressurize the fuel tank, the

carburettor has a fuel pump that

take the necessary quantity of fuel

to allow right working.

•Never start the engine without

wearing leather glove or without an

electric starter.

PACKING LIST:

1 Aviomac engine 125cc Twin

2 Spark plugs

2 Spark plugs covers

1 AT coil

1 Ignition control box

1 Easy Starter

1 Carburettor

1 Instruction manual

2 Aviomac stickers.

INSTALLATION GUIDE

Here you will find some

recommendations. Read them before

install your engine:

1. To reduce possible RF

interference, we recommend to

maintain a 20-30 cm distance

between the engine and the

receiver, servos and the receiver

battery pack.

2. Always use steel screws with self-

looking nuts to ensure the engine

to the firewall.

3. Use a minimum 7mm firewall for

engine installation.

4. Check the tightening of screws

after first flight and periodically

every 5 flight hours.

5. We recommend to use nylon

pushrods, fibreglass or fibre wood

for attach the throttle linkage.

Metal pushrods could cause radio

interference or vibration inside the

engine.

WWW.AVIOMAC.COM AVIOMAC 125 TWIN (IDM)

ENGINE MOUNTING

1. Engine has been designed to

being mounted with the carburettor

facing downward to avoid flooding.

2. The ignition is located on the rear

of the engine. If you need to place

the ignition control box behind the

firewall drill a 12mm hole in order

to feeding ignition wires through

the hole.

3. Mount the engine to the firewall

using only M6 steel screws, metal

washers and self-looking nuts.

4. It is recommended to mount coils

and ignition control box on elastic

supports, possibly behind the

firewall and far away from radio

components.

5. We recommend you to install two

different kill switches, one external

and one internal activated by a

servo. In this way you can switch

off the engine when it is on the

ground or when it is on flight in an

emergency. See the following

electric drawing for a correct

installation.

ADDITIONAL PARTS RECCOMENDED

FOR INSTALLATION (NOT INCLUDED):

1-elastic spacer for AT coil

1-elastic spacer for ignition system

2-M6x16 steel screws with self-looking

nuts.

60 cm of wire for kill switch and ground

strap.

1-external kill switch

1-servo internal kill switch

4-M6x25 screws complete of washers

and self-looking nuts

EASY STARTER INSTALLATION

The Easy Starter is an accessory that

allow an easier start of the engine. The

Easy Starter need 8 AA batteries (not

included and preferably rechargeable) for

power.

The engine can be started without Easy

Starter using an electric starter.

The Easy Starter connector installed on

the ignition control box can be fixed with

some screws to the firewall. It has to face

the external part of the plane in order to

communicate outside through a hole of

appropriate size. This will give you the

possibility to connect the Easy Starter

easily when you start the engine.

WWW.AVIOMAC.COM AVIOMAC 125 TWIN (IDM)

FUEL

The engine works with a fuel-oil mixture

at a ratio of 4% (25:1). Example: 10 litres

of fuel and 0,4 litres of oil. Use always

fresh unleaded fuel and high-quality oil,

we recommend Shell Advance Racing oil.

Do not use old fuel or fuel that has been

stored for over 3 months.

CARBURETTOR SETTING

The carburettor has 2 needles for

carburation setting and one needle for

minimum setting. The needle marked with

a L enables low RPM, the needle marked

with a H enables high RPM, the needle

marked with IDLE serves to keep the

engine running at idle. Turning clockwise

L and H needles will lean the mixture

(less fuel), turning counter clockwise the

needles will rich the mixture (more fuel).

We recommend to start with this setting:

close completely the Hneedle and turns it

out of 1 turn, close completely the L

needle and turns it out of 1 turn and ½.

Do not try to adjust the needles with the

engine running because the propeller

could cause severe damage, so shut the

engine off before start setting the

carburation.

Gasoline carburettor are much sensitive

than GLOW carburettor, so they need

precise setting to allow the engine

working well. Avoid making more than 1/8

turn adjustment of carburation needles.

The third needle is the IDLE stop needle,

it serves for keep engine running at idle.

We suggest to screw it out to allow the

engine to be killed. The throttle has a

spring that allow it to return to idle. If you

want, you could release the spring to

avoid a constant load on the servo.

We recommend to maintain the spring on

its original position when you test the

engine on a work bench. Never remove

the spring from the carburettor.

PROPELLER:with Aviomac 125cc

engine we recommend propellers as

following: 28x10, 30x10, 32x10.

Propeller hub is designed to allow the

installation of 2 security screws. We

highly recommend installing these screw

to avoid dangerous falling of the

propeller.

WWW.AVIOMAC.COM AVIOMAC 125 TWIN (IDM)

STARTING PROCEDURE

PRIMING

1. Before starting the engine, it is

useful a priming procedure. Make

sure that the AT coil is switched off

by activating the kill switch or

grounding the black/white wire.

2. With the ignition turn off, speed

up completely, close the coche

plate and swing the propeller

several time. This will draw fuel

into the carburettor. Continue

swinging until you see fuel drip out

of the carburettor.

CAUTION: do this procedure only

when the carburettor is facing

downward.

HAND STARTING

1. Connect the Easy Starter into

the connector of the ignition

control box. Press the button

on the Easy Starter and make

sure that the red LED lights.

2. Open the coche plate, speed

up slightly, deactivate the kill

switch and make sure that the

aircraft is restrained or

someone hold it. Flip the

propeller until the engine starts.

If the engine does not start,

repeat priming procedure until it

starts.

NOTE:Always turn the Easy Starter off

before you disconnect it from your

aircraft, otherwise electric shock and

damages on the ignition can occur.

ELECTRIC STARTER

If you use an electric starter, Easy Starter

is not necessary. Follow the same

starting procedure and of course do not

connect the Easy Starter.

CARBURATION

Let the engine warming up for first 30

seconds before tune or speed up. The

carburation begin with the tuning of low-

speed needle (L) and then it is followed

by the tuning of high-speed needle (H).

Low-speed needle adjustment: if the

engine coughs, the mixture is too rich, so

turning it in a 1/16 turn at a time until the

engine does not go better. If the engine

does not accelerate from the idle, the

mixture is too lean. Turning low-speed

needle out a 1/16 turn at a time.

High-speed needle adjustment (H):

After you have adjusted the low-speed

needle (L) is the moment to tune up the

high-speed needle (H). Speed up

completely. If the engine drops RPM it

means that your mixture is too rich.

Screw clockwise the high-speed needle

(H) for 1/16 turn at time until the engine

work well. Tune the high-speed needle

(H) to allow the engine to reach maximum

RPM, then turn it out until the engine

reduce by 50-100 RPM. This will

guarantee a carburation not too lean and

a longer life for the engine.

Recheck and eventually adjust the low-

speed needle adjustment (L).

WWW.AVIOMAC.COM AVIOMAC 125 TWIN (IDM)

PROCEDURE FOR MAGNETIC IGNITION TUNING

All Aviomac engines are sent with ignition yet tuned up for work well, but after the

disassembly of the ignition and for all adjustment needing, you have to follow this

procedure:

1. Insert the rotor on the crankshaft; we remind you to use its positioning key and

block it with its screw (included in the shipment).

2. Position the comparator on the cylinder and take the piston to the Upper Dead

Centre (UDC).

3. Rotate the crankshaft counter clockwise and take the piston to 2mm before the

UDC.

4. Position the ignition as you see in the drawing.

5. Finally you have to block the stator with its 4 screws.

WWW.AVIOMAC.COM AVIOMAC 125 TWIN (IDM)

WARRANTY

The engine has a 3-year warranty from

the date of purchase for material and

manufacturing defects. The warranty is

limited at the original purchaser and it

cannot be transferred.

The warranty does not cover:

1. Normal wear of the engine

2. Damage resulting from inadequate

maintenance

3. Damage resulting from

overrunning, caused by the loss of

one propeller or by using a

propeller too small.

4. Damage resulting from bad

carburation (too lean)

5. Damage resulting from a crash

6. Damage resulting from using not

original spark plugs

7. Damage resulting from using not

suitable fuel or oil

8. Damage resulting from outsider

objects that have got in the engine

9. Damage resulting from modifying

engine components.

10.Damage resulting from the

disassembly of the engine by non-

authorized staff.

11.Damage resulting from wrong

installation of the engine

12.Damage resulting from unfit using

of the engine

For warranty or non-warranty services,

you can send your engine well-packed

and with transport paid at the following

address:

MGR Group Srl

Via dell’Artigianato, 12

37060 Sona (VR) Italy

Phone number: ++39-045-6095552

Together with the engine you have to add

your name, your address and your phone

number (or an email address) for a

possible contact and to return you the

engine. The engine has to be delivered

complete of ignition.

In case of non-warranty service, we will

contact the costumer to inform him about

cost and means of payment.

Do not send mufflers, propellers, fuel, oil

or accessories not included in the original

packing of the engine. Include a complete

written explanation of the problem and

setting used (propeller measure, brand

and mixture of oil and fuel, spark plugs

installed, etc.).

IMPORTANT:

The warranty will be valid only if the

warranty form is filled in all parts and it is

sent by fax, e-mail or postal mail within 10

days from the date of purchase.

Warranty will be valid for 3 year from the

purchase date, attested by the purchase

invoice or the receipt.

Please save original invoice or receipt :

the warranty will not be valid without

these documents.

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