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ENGLISH
DATA SHEET THOR 303 THOR 303 DS
Polini Engine 2 stroke monocylinder 2 stroke monocylinder
Cooling Liquid cooled Liquid cooled
Bore for stroke 76 x 62 76 x 62
Displacement 281 cm3 281 cm3
Power 38 HP at 8000 rpm 38 HP at 8000 rpm
*Max trust 120 Kg with Ø 160 cm propeller 120 Kg with Ø 160 cm propeller
R.P.M. max 8.400 8.400
Cylinder Aluminum with Gilnisil coating Aluminum with Gilnisil coating
Compression ratio 11,2:1 11,2:1
Piston Two trapezoidal chromium plated rings Two trapezoidal chromium plated rings
Intake Reed valve in the crankcase Reed valve in the crankcase
Carburetor Dell’Orto VHST 28mm Dell’Orto VHST 28mm
Air filter Air box Air box
Ignition 1 Electronic 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 hood 5k Ω resistance 5k Ω resistance
**Fuel type E5 petrol or LL AV GAS-al with 2,5% synthetic oil 100% E5 unleaded petrol or LL AV GAS-al with 2,5% synthetic oil 100%
*Consumption 3 Lh 30 Kg a of static trust 3 Lh 30 Kg a of static trust
Gear reduction unit Helicoidal teeth in oil bath with 2,8 or 3,2 reduction ratio Helicoidal teeth in oil bath with 2,8 or 3,2 reduction ratio
Starter Flash Starter - (Electric starter -optional) Electric starter+ flash starter
Clutch Centrifugal in oil bath Centrifugal in oil bath
Muffler Expansion with aluminum silencer Expansion with aluminum silencer
Engine weight Starting from Kg 20,5 (manual starter model +radiator) Starting from Kg 22,3 wiht radiator
Propeller rotation Clockwise Clockwise
12- DEFECTS DIAGNOSIS CAUSE SOLUTION
The engine doesn't start Out of petrol Add petrol
Petrol doesn't reach the carburetor Check the fuel system circuit
Old or wrong petrol Empty the tank and the fuel system circuit and replace the petrol.
Flooded engine
Remove the spark plug, start the engine, dry or replace the spark plug.
Defective spark plug Replace it
Blackened or wet spark plug Clean and dry the spark plug or replace it
Earth switching off cable Check the tightening
Spark plug hood wrong installed Check it
Carburetor has problems Clean and check it; eventually replace the diaphragm
No spark Check the ignition, coil and wiring
The engine doesn't idle Dirty carburetor Clean and check the carburetor
Out-of-adjustment screws Calibrate the carburetor again
Defective spark plug Replace it
The engine doesn't reach the maximum rpm Wrong carburetion Calibrate the carburetor
The carburetor has problems Clean and check it; eventually replace the diaphragm
The reed valve has problems Replace the reeds or the whole reed valve
Dirty air filter Clean or replace it
Dirty exhaust Clean or replace the deadening material
Engine revs up when idling Out-of-adjustment screws Calibrate the carburetor
Air through the gaskets Replace the gaskets and seals
*The values have been detected on the sea level at standard atmosphere. The trust and consumption values may vary according to the air temperature and density.
**E5 means the petrol type that can be used. E5= unleaded petrol 95 octanes up to 5% of ethanol. This symbol is shown on all the petrol pumps in Europe.
Only use Polini Motori original spare parte “For all the technical details/manuals/optional please check www.polini.com-> Thor section”
“The manufacturer has the right to make any modifications that can be useful to improve the features and performance of the products”
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