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24- ENGINE PROBLEM DIAGNOSTIC
The engine doesn't start
The engine doesn't idle
The engine doesn't reach the maximum rpm Wrong carburetion
Engine revs up when idling
TECHNICAL LIST
Polini engine
Cooling
Bore for stroke
Displacement
Power
Maximum trust*
R.P.M. max
Cylinder
Compression ratio
Piston
Intake
Carburetor
Air filter
Ignition 1
Spark plug hood
*Fuel type
**Fuel consumption
Gear reduction unit
Starter
Clutch
Muffler
Engine weight
Propeller rotation
*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
CAUSE
Out of petrol
Petrol doesn't reach the carburetor Check the fuel system circuit
Old or wrong petrol
Flooded engine
Defective spark plug
Blackened or wet spark plug
Earth switching off cable
Spark plug hood wrong installed Check it
Carburetor has problems
No spark
Dirty carburetor
Out-of-adjustment screws
Defective spark plug
The carburetor has problems
The reed valve has problems
Dirty air filter
Dirty exhaust
Out-of-adjustment screws
Air through the gaskets
THOR 202
2-stroke monocylinder
Liquid cooled
76 x 60
205 cm3
33 HP
90 Kg with Ø 130 cm propeller
8500
aluminum with Gilnisil coating
11,5
Two chromium plated rings (mm 1) -
Reed valve in the crankcase
Dell'Orto VHST
Air box
Inductive electronic T.C.I. with fix advance
5k resistance
Fuel E5 o LL 100 AV GAS-al 2,5% with 100% synthetic oil
2,4 Lh at 30 Kg of static trust
Helical teeth in oil bath with 2,8 reduction ratio
Flash starter
Centrifugal in oil bath
Expansion with aluminium silencer
Starting form 16,8
Clockwise
SOLUTION
Add petrol
Empty the tank and the fuel system circuit and replace the petrol.
Remove the spark plug, start the engine, dry or replace the spark plug.
Replace it
Clean and dry the spark plug or replace it
Check the tightening
Clean and check it; eventually replace the diaphragm
Check the ignition, coil and wiring
Clean and check the carburetor
Calibrate the carburetor again
Replace it
Calibrate the carburetor
Clean and check it; eventually replace the diaphragm
Replace the reeds or the whole reed valve
Clean or replace it
Clean or replace the deadening material
Calibrate the carburetor
Replace the gaskets and seals
19
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