14
15
ENGLISH
ENGLISH
3.3- DUAL SPARL ELECTRIC STARTER – IGNITIONS TESTS
Fill the fuel system as indicated in paragraph 3.1.
Thor 303 DUAL SPARK engine has a control console with a cut-out switch
(photo 2)
02
OFF
ON
LED
TEST 1
START
TEST 2
that must be fixed in a comfortable position and easy to be reached
by the pilot.
The engine has two separated ignitions and the console let you check the
correct working of both the ignitions.
When the ignition is on OFF position the engine is switched off and the
electric starter does not work. By moving the switch to ON position the
led will light.
Use the central black key (START) to start the engine. After having
started the engine keep KEY 1 pressed to disable ignition 1 and it is
possible to check the correct working of ignition 2. The engine must keep
on working. Now release KEY 1.
Repeat the test keeping KEY 2 pressed. It disables ignition 2 and it is
possible to check the correct working of ignition 1. The engine must keep
on working. Now release KEY 2.
Now to end the test press KEY1 and KEY2 simultaneously, so disabling
both the ignitions. The engine now has to stop.
Now start the engine again and it is ready to fly.
NOTE 1:
to switch the engine off in standard conditions use the switch
moving the lever in OFF position.
NOTE 2:
The secondary electronic ignition works using the battery. This
ignition, if fed, (switch in ON position) has an electric input even with
the engine switched off. This input can discharge the battery in a few
days. It is important to re-position the cut-out switch in OFF position.
(LED switched off)
NOTE 3:
If the battery should be completely discharged it is possible
to use the engine by starting it manually. Keep into consideration that
till the battery does not reach a minimum charge level the engine will
work with one ignition only.
4- RUNNING IN
Run your engine in as instructed below to ensure that the engine and
transmission bed in correctly and to ensure continuous reliability in
future. Once the engine starts, leave it idling until it warms up to normal
temperature. We suggest running the engine 15 minutes at medium-low
engine power output gently accelerating and with different intensity.
Now we suggest checking the correct idling calibration.
During the first flights or for the first 20 litres of petrol we suggest not
keeping the engine at the maximum rpm for too much time, considering
that the 2-stroke engine doesn’t stand to the constant rpm even if of
medium power. We suggest varying the engine rpm. Check the carbure-
tion after the first flight. Repeat the running in every time you change
one of the following parts: piston, piston rings, cylinder, crankshaft or
main bearings.
5- ENGINE SWITCHING OFF
Per spegnere il motore azionare l’apposito pulsante fino a completo
spegnimento.
Se il motore è equipaggiato con il comando acceleratore Polini il tasto
di spegnimento è di colore rosso ed è situato nella zona superiore; in
caso contrario fare riferimento alle istruzioni del costruttore del telaio/
acceleratore per l’individuazione del pulsante di spegnimento.
Per il THOR 303 DUAL SPARK azionare la leva della consolle di comando
in posizione OFF per disattivare entrambe le accensioni contemporane-
amente e spegnere il motore.
6- CARBURETION CHECK
The carburetion setting must be executed by professional people only.
It is possible to make a fast analysis of the carburetion by checking the
spark plug colour. To do it, switch the engine off after having run it for
some second under charge.
Remove the spark plug unscrewing it with the proper tool and verify
the colour of the porcelain that must be of light-brown colour with
tendency to dark. A light colour of the spark plug electrode means a
lean carburetion; if you use the engine in this conditions may cause the
engine failure. Do not use the engine in these conditions and apply to
an authorized retailer to set it up.
7- CLEANING
Clean the engine when it is switched off and cold to avoid burns. Clean
the engine with a soft cloth soaked with neutral cleansing and non-
aggressive.
!
WARNING:
Do not use acids that may damage the engine.
!
WARNING!
solvents 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 the fuel tank during its carriage. Be careful of the petrol during the
carriage: its leaking may cause a fire.
!
ATTENTION:
During the carriage of the engine it is strictly recom-
mended to maintain the propeller locked together with its nut in order
to avoid that the flange thread that sticks out may be damaged or in
case of fall it might break the crankshaft.
The carburetor has a breather pipe studied to carry the engine when
lying. To empty the carburettor unscrew half turn the breather brass nut
(highlighted in photo 3 with an arrow) and wait till all the fuel enters
the tank. Tighten the brass connection again. Now the carburettor is
empty and you can lay the engine ready to be carried.
!
ATTENTION:
never unscrew more than half a turn the breather nut
to avoid damaging the OR seal. Never tight too hard.
03
9- ORDINARY SERVICING
!
ATTENTION: THE SERVICING OPERATIONS MUST BE DONE
BY QUALIFIED PEOPLE ONLY. IF THE INSTRUCTIONS MENTIO-
NED BELOW WILL RESULT NOT CLEAR, WE SUGGEST ASKING
FOR SPECIALISTS BY POLINI MOTORI RETAILERS OR WHOLE-
SALERS. FOLLOW CAREFULLY WHAT DESCRIBED BELOW.
Maintenances and servicing necessary for the best set up of your engine
should be done regularly, or on all occasions before you start your en-
gine. All the tasks and adjustments described below can be done easily
by following the instructions given in this manual. Refer to your POLINI
MOTORI dealer for scheduled services and repairs, and insist that only
original spare parts are used to replace worn or broken components.
Refer to the servicing tables in sections 12 below for the frequency with
which the various servicing operations must be performed.
9.1- AIR FILTER CHANGE AND CLEANING
Dirty air filter is one of the most common causes of poor engine per-
formance.
Clean the filter periodically or change it. Remove the filter loosening the
clamps, unscrew the 2 screws using a cross screwdriver, remove the filter
cover and then the filter. Wash the filtering material with water and mild
soap. Dry the filter carefully, and then moisten it with oil for filters.
Clean filter box inside using a cloth and check the presence of foreign
bodies. Now reassemble all the parts. Wash the filter for maximum 2-3
times and then replace it with a new one.
!
WARNING!
If the filter becomes clogged with fine dust as well as
normal dirt, replace it with a new one.
!
WARNING!
Dirty air filter may compromise the correct operation
of the engine and it causes poor performance. Torn or broken filters can
allow dirt to enter the engine and cause rapid deterioration of the piston
rings, piston and barrel.
9.2- GEAR REDUCTION OIL CHECK
Operate when the engine is cold. Maintain the engine in vertical position and
remove the oil level screw on the transmission crankcase. (photo 4 – OIL
LEVEL). Check that the oil level reaches the lower edge of the level hole. If there
is too much oil, let it flow out from the hole until it stops flowing and collect
the oil in a suitable container. If there is not enough oil, top up as required
through the breather hole located at the top.
After checking it, tighten the screws. Use ELF Moto Gear Oil 10 W 40 ANTI Clutch
Slippage or Shell advance gear SAE 10 W 40 API GL-3
9.3- GEAR OIL CHANGE
Change the oil when the engine is cold. Unscrew the screw on the lower
side of the clutch/gear group (Photo 4-A).
04
OIL LEVEL
A
Collect the oil flowing out in a suitable container. Wait till the oil has
completely flown out and, if necessary, tilt the engine to the side to
make this operation easier. Tighten the screw withy strength. Unscrew
the breather pipe in the top side of the crankcase (photo 5)
05
and fill it out with 100cc of ELF Moto Gear Oil 10 W 40 ANTI Clutch Slip-
page oil. Fit the pipe and its tube again. As an alternative you can use
also oil: Shell advance gear SAE 10 W 40 API GL-3 or an oil with 10W40
viscosity compatible with clutch (similar to motorcycle engine oil)
!
WARNING!
Do not throw spent oil into the environment. Dispose
of it correctly through authorized collection points.
9.4- STARTER ROPE REPLACEMENT (FLASH STARTER)
Remove the starter from the engine unscrewing the 4 screws (Photo 6).
06
