12- SERVICING TABLE
Every use Check the bolts and screws tightening
Check the silent-block conditions
After the first 10 hours Replace the gear oil
Check the carburation
Every 50 hours Replace spark plug NGK BR 10 ES
Clean the air filter
Replace the gear oil
Check the starter wearing and eventually replace the rope and the lockpins
Every 100 hours or every year Replace the air filter
Replace the starter rope and the lockpins
Replace the diaphragm and clean it
Replace the silent-block
Replace the fuel system pipes
replace muffler springs
Check the reed valve
Every 100 hours Check the piston, the piston rings and the small end bearing
Decarbonize and clean the decompression hole
Every 150 hours Remove the gear and check the clutch and bell wear
Replace the piston, the piston rings and the small end bearing
replace the silencer deadening material
Replace the reed valve
Every 300 hours Replace all the bearings and seals
Replace the crankshaft
Replace the cylinder
TECHNICAL SCHEDULE THOR 250 THOR 250 DUAL SPARK
Polini engine 2-stroke monocylinder 2-stroke monocylinder
Cooling Liquid cooled Liquid cooled
Bore for stroke 72 x 60 72 x 60
Displacement 244 cm3 244 cm3
Power 36 HP at 7500 R.P.M. 36,5 HP at 7500 R.P.M.
Cylinder aluminum with Gilnisil coating aluminum with Gilnisil coating
Compression ratio 11,5:1 11,5:1
Piston Two chromium plated rings (mm 1) - Two chromium plated rings (mm 1) -
Intake Reed valve in the crankcase Reed valve in the crankcase
Carburetor Ø 28 bowl carb. Ø 28 bowl carb.
Air filter Air box Air box
Ignition 1 Electronic with possible battery charge Electronic
Ignition 2 - Battery fed
Battery charger arrangement
output power: 80W at 5500 rpm output power: 80W at 5500 rpm
Spark plug hood 5k resistance 5k resistance
Fuel type Lead free petrol with 2% synthetic oil Lead free petrol with 2% synthetic oil
Gear reduction unit Helical teeth in oil bath with 2,8 reduction ratio Helical teeth in oil bath with 2,8 reduction ratio
Starter
Pull starter with self-winding rope-FLASH STARTER (electric starter as OPTIONAL) Electric+Pull starter with self-winding rope -FLASH STARTER
Clutch Centrifugal in oil bath Centrifugal in oil bath
Muffler Expansion with aluminum silencer Expansion with aluminum silencer
Engine weight 18 Kg (19 Kg with elect. starter) without radiator 18,5 Kg (19,5 Kg + electric starter) without radiator
Propeller rotation Clockwise Clockwise
TIGHTENING TORQUE VALUE for ENGINE BOLTS AND SCREWS
M N.m Kgf.m Lbf.ft
Locking compound
HEAD SCREWS 6 12 1,2 8,8
HEAD NUTS 8 18 1,8 13,2
CLUTCH NUT 20 100 10 74
CRANKSHAFT NUT (IGNITION SIDE) 12 80 8 39
PROPELLER CENTRAL NUT (LEFT THREAD) 10 80 8 39
SPARK PLUG 20 2 14,8
CRANKCASE SCREW 6 8 0,8 5,9
COUNTERSHAFT NUT 12 60 6 44,2
INTAKE MANIFOLD LOCKING SCREWS 6 8 0,8 5,9
MUFFLER STUDS NUTS 8 18 1,8 13,2 LOCTITE 270
SILENCER LOCKING SCREWS 8 15 1,5 11,1 LOCTITE 243
MUFFLER LOCKING SCREWS 8 15 1,5 11,1 LOCTITE 243
STANDARD TIGHTENING TORQUE VALUE N.m Kgf.m Lbf.ft
5MM BOLT AND NUT 6 0,6 4,44
6MM BOLT AND NUT 10 1 7,40
8MM BOLT AND NUT 25 2,5 18,50
10MM BOLT AND NUT 45 4,5 33,30
12MM BOLT AND NUT 55 5,5 40,70
13. ENGINE PROBLEM DIAGNOSTIC 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
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