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ENGLISH

ENGLISH

        ENGLISH

INTRODUCTION 

Congratulation for purchasing a Polini Thor engine. By purchasing it 

you have become one of a large family of satisfied Polini products 

owners. Thor product has been designed to perform as competitively as 

possible. Read this use and maintenance manual carefully throughout 

before flying with your new engine. This manual contains important 

information that will help you to achieve the best satisfactions with the 

use of the Thor engine. To ensure care-free and satisfying usage you 

must get to know your new engine thoroughly and set it up correctly 

before you start using it.

INDEX 

1 - GENERAL ADVICES/WARRANTY

2 - FUEL

3 - ENGINE STARTING

3.1 - MANUAL STARTER

3.2 - ELECTRIC STARTER

3.3 - DUAL SPARL ELECTRIC STARTER – IGNITIONS TESTS

4 - RUNNING IN

5 - ENGINE SWITCING OFF

6 - CARBURETION CHECK

7 - CLEANING

8 - CARRIAGE

9 - ORDINARY SERVICING

9.1 - AIR FILTER CHANGE AND CLEANING

9.2 - GEAR REDUCTION OIL CHECK

9.3 - GEAR OIL CHANGE

9.4 - STARTER ROPE REPLACEMENR (FLASH STARTER)

9.5 - COOLANT LEVEL CHECK

9.6 - COOLING SYSTEM EMPTYING

9.7 - COOLING SYSTEM FILLING

10 - BEHAVIOR IN FLIGHT

10.1 - TEMPERATURE THERESHOLDS 

11 - ENGINE FITTING ON THE FRAME

11.1 - THOR 303 DUAL SPARK

11.2 - ELECTRIC STARTER

11.3 - FUEL LINE

11.4 - THROTTLE

11.5 - PROPELLER

11.6 - GEAR REDUCTION

12 - DEFECTS DIAGNOSIS

13 - SERVICING TABLE 

1- GENERAL ADVICES 

Polini Motori and the distributor decline any and all responsibilities 

whatsoever - either direct or indirect - for the use of the engine, above 

all in the case the engine is modified or manumitted by third parties. 

Polini Motori doesn’t assume responsibility for damages caused by little 

servicing or wrong assembly, excluding the pieces from the warranty. 

Any technical modification may be introduced by the buyer, who assu-

mes all the responsibilities for possible damages; spare parts for any 

modification are not under warranty. We advice you that any engine 

modification made by the buyer or the removal of original parts may 

make the engine dangerous to be used!

The user is invited to respect and follow what written in the use and 

maintenance manual for his own and third parties safety. When you use 

this engine you are making a very dangerous action, so you may have 

the maximum care before, during and after flying, in order to avoid 

serious accidents. 

Because of the risks inherent to the engine use, and the flight, Polini do-

esn’t give any warranty against accidents, breakings, injuries or death. 

To fly always needs great attention. Be aware that you fly at your risk. 

Before every use check the good conditions of your engine. 

This engine 

is not covered by any responsibility insurance. By using it you 

automatically assume all the risks inherent the paramotor sport 

or the personal responsibility towards damages to yourself or 

to third parties, accidents, injuries or death. We invite you to 

carefully read the instructions contained in this manual since 

they are helpful for a better knowledge of the products and the 

use itself and useful to prevent and contain the risks.

WARRANTY

 

All the Polini engines are manufactured with high quality materials 

which grant a product without defects, under the conditions that the 

buyer purchases the products from a Polini authorized dealer

VALIDITY OF THE WARRANTY

The warranty is valid for a period of 12 months from the date of pur-

chase by the end user.

It is necessary to activate the warranty by filling the form out (see last 

page) and keeping the payment slip or the invoice.

COVERAGE

The present warranty covers the engine damages caused by defective 

parts, in shape or materials, for projects not in conformity with the use 

indicated, wrong assembly by the manufacturer. The warranty includes 

spare parts only. Delivery costs are charged to the user.
The warranty doesn’t cover damaged caused by:

- Engine modifications not approved by Polini;

- Wear and tear of the parts; 

- Carelessness, lack of servicing, accidents, installations or wrong main 

 tenance;

- Accidental falls or engine fall or of its components;

- Engine improper use or misusage;

- Assembly of parts or components not proper for the engine use;

- Engine overheating or stop after long usage, beyond the term 

  indicated by Polini;

- Missing or irregular engine servicing as suggested by Polini, use of   

  impro per petrol or oils, presence of dirty parts or foreign bodies in   

  the engine, even sucked;

- Engine overwork because overloaded;

- Use of propellers not certified by Polini

- Deterioration of the engine or parts of it because of improperly 

 storage; 

- Faulty engine assembly, including the use of not original Polini parts  

  or coming from third parties;

- Damages to the engine caused by foreign bodies;

- Use of the engine for competition purposes

- Use of the engine without propeller

FINAL USER OBLIGATIONS

Claims shall be done by delivering the engine to a Polini authorized 

dealer. The user shall provide the original document that proves the 

purchasing or the warranty ticket authenticated by Polini or by its di-

stributor. To keep the validity of the warranty the user shall carry out 

recurrent servicing according to the use and maintenance manual.

LIMITED LIABILITY

Pursuant to this warranty, Polini’s obligations are limited to the defec-

tive parts reparation or, at its discretion, to change one or more parts, 

necessary to remedy every malfunctioning caused by defective materials 

or labor covered by the warranty. Polini or the distributor can’t be held 

responsible for problems or damages to persons/things/animals during 

the engine life. We remind you that 

this product is not certificated 

and that it can break or suddenly stop working. No warranty or com-

pensation is foreseen for damages caused to:

- persons/animals/things during the engine use

- persons/animals/things caused by a collide with the propeller or with

  parts detached from the engine

- frame, parts and/or propeller caused by the collide with parts coming

  out from the engine

- costs for rescue, shipping, phone or rent after the collide, problems or

  loss of time, or other indirect damages.

DANGER! 

This not-certified engine can suddenly stop working. The 

engine stop can require emergency landings causing injuries or death. 

The aircraft thrusts by this engine should fly in open spaces only or 

during the daylight. This product is not covered by products and public 

liability. Who flies with this engine or only switches it on assumes all 

the risks inherent to engine flying sport and all the responsibilities for 

damages to things or persons or death caused by the use of this product.

On accounts of this, the guarantee does not cover damages caused 

by the installation of the engines on machines that requires certified 

engines, on machines that are not adequate, on machines that requires 

different type of engine. The vendor won’t be responsible for damages 

caused by the users or third parties.

2- FUEL 

Thor is a 2-stroke engine that needs oil/petrol mixture. Only use good 

lead-free petrol purchased by a petrol station with 95 octanes. Add good 

2,5% synthetic oil to the petrol. 

Never keep the petrol into containers for a long time because its quality 

will be damaged. Only use certified metallic containers for petrol carria-

ge. Mix up the petrol with the oil ONLY when you are using it.

!

 

WARNING!

 The nature of the carbon deposits on the cylinder head, 

spark plug and exhaust port give important information about the fuel 

mixture burning in your engine. Remember that mixes that contain too 

much oil do not extend the engine’s life.

!

 

WARNING!

 petrol is extremely inflammable and explosive. Car-

ry out these operations in a well ventilate place and with the engine 

switched off. Refrain from smoking and avoid all naked flames or sparks 

where petrol is being drained or where re-fuelling is being performed.

!

 

ATTENTION!

 For American customers only. The European range of 

octane is different from the American one:

e.g. EU 95 OCTANE = US 91 OCTANE / EU 98 OCTANE = US 93 OCTANE

For THOR engines you have to use a high-octane gasoline (not less than 

US 91), max 5% ethanol.

!

 

WARNING!

 it is important to use 100 LL AVGAS in case of unavai-

lability of the fuel recommended above.

3- ENGINE STARTING

 

Start the engine only when all is in good conditions and perfectly wor-

king and check that there aren’t persons, things or animals around. 

Furthermore check that all the nuts are well tightened.

3.1- MANUAL STARTER

Fill in the fuel system through the proper fuel pump. Make petrol reach 

the carburetor hole and then pump up 4-5 times  to fill in the bowl. To 

start the engine pull upwards the black lever placed in the upper side of 

the carburettor (photo 1). 

01

Operate the starter without accelerating till the engine starts. Once it 

runs switch it off, disconnect the starter and start the engine again 

slightly accelerating. 

For your safety only start the engine after your harness has been COM-

PLETELY fixed!

To make the starter easy you can install the starter control   (optional-

Item 343.0038 together with 316.0010,m 316.0011 or 316.0012)

3.2- ELECTRIC STARTER

 

Fill the fuel system in as shown in the previous paragraph.

To start the engine pull upwards the black lever placed in the upper side 

of the carburettor (photo 1).

If your engine is equipped with a Polini throttle control press the two 

black buttons together and slightly accelerate till the engine runs. Once 

it runs switch it off, disconnect the starter by lowing the lever. Start the 

engine again slightly accelerating. 

If the engine is not equipped with a Polini throttle control please refer 

to the instructions of the vehicle’s manufacturer to find out the switch 

on/off buttons. 

!

 

ATTENTION!

 keep the switch in your hand during all the stages and be 

ready to operate it in case of any technical fault. If necessary keep it pressed 

till the engine has completely stopped.

Once the engine starts we suggest testing the right functioning of the kill switch 

button. After having checked it, start the engine again without accelerating 

and without using the starter. Now start the engine and leave it idling, slightly 

accelerating it, until it warms up to min. 55° of operating temperature.

Summary of Contents for THOR 303

Page 1: ...THOR 303 MANUALE D USO E MANUTENZIONE USE AND MAINTENANCE MANUAL...

Page 2: ...ortata dall acquirente o la rimozione di parti originali possono rendere il motore pericoloso L utente invitato a rispettare ed attenersi a quanto indicato e consi gliato nel manuale d uso e manutenzi...

Page 3: ...e installare l apposito co mando starter a distanza opzionale codice 343 0038 da abbinare ad uno dei 3 codici 316 0010 316 0011 o 316 0012 3 2 AVVIAMENTO ELETTRICO Eseguire il riempimento del circuito...

Page 4: ...filtrante in acqua calda con sapone neutro Asciugare accuratamente e successivamente umidificarlo con idoneo olio per filtri Pulire con un panno l interno della scatola filtri assicurandosi che non v...

Page 5: ...llazione del termostato con apertura a 60 C cod 928 830 009 Un eventuale controllo della temperatura EGT pu essere effettuato con la termocoppia opzionale cod 928 830 014 da inserire nell apposita sed...

Page 6: ...bero riduttore con il lato sporgente verso il motore Posizionare il dado filetto sinistro di centraggio e avvitarlo manual mente fino a battuta sulla flangia il dado verr serrato completamente in una...

Page 7: ...ata Far tarare il carburatore Il carburatore ha dei problemi Pulizia e verifica del carburatore eventuale sostituzione membrane Il pacco lamellare ha dei problemi Sostituzione delle lamelle o dell int...

Page 8: ...nticated by Polini or by its di stributor To keep the validity of the warranty the user shall carry out recurrent servicing according to the use and maintenance manual LIMITED LIABILITY Pursuant to th...

Page 9: ...lvents may damage the engines the painting and the rubber parts 8 CARRIAGE ATTENTION Carry the engine only when it is cold Follow the frame manufacturer s instructions for its carriage and how to use...

Page 10: ...25 006 see exploded view B CAUTION If it is necessary to install the engine radiator the en gine please carefully follow exploded view B to avoid a drain pipe 10 HOW TO BEHAVE IN FLIGHT Maximum accele...

Page 11: ...d 928 225 004 to avoid air bubbles may start see exploded view B Fill the cooling system using coolant specifically designed for aluminum radiators up to 1 2 of the expansion tank For the circuit with...

Page 12: ...CDI with adj advance Electronic CDI with adj advance Ignition 2 Electronic CDI with adj advance Battery charger prearrangement Output power 40W at 5500 RPM Output power 40 W at 5000 RPM Spark plug hoo...

Page 13: ...Polini Motori S p A viale Piave 30 24022 Alzano Lombardo BG Italy Tel 39 035 22751 1 1 news polini com www polinithor com PI 773 06A21...

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