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Polini THOR 250 DUAL SPARK engine features 2 spark plugs and 2 independent ignitions to grant the maximum safety standard in every condition of flight. The liquid cooling system grants an extraordinary steady power output and better performance at every rpm.

Many are the advanced technical solutions adopted.

  • The die cast light-alloy aluminium cylinder grants a better thermal stability.
  • The piston, gravity cast at high silicon content light alloy, reduces thermal expansion and the coupling slack. The piston top design is specific to optimize the compression ratio.
  • It is provided with a balancing countershaft; this feature cancels the vibrations and guarantees such a comfort when driving never felt during a flight and a better engine lasting. The counter revolving rollers considerably decrease the upsetting torque-steer for a further flight comfort.
  • The centrifugal clutch is entirely in oil bath, with a mechanical gear with helical teeth.
  • The electric starter is standard but for higher safety level it is also equipped with manual starter, with easy-system thanks to the flash starter device, which speeds up and simplifies the movements.
  • The comfortable closed circuit system for the fuel recovery during transportation and the 12V output for any eventual electrical use.

Thor 250 DUAL SPARK engine is small and very compact with a great power/weigh ratio. The advanced technology and the great performance of this engine gives a better feeling when driving making the flight even more performing, dynamic, reactive, beside granting more stability.

Polini Engine 2 stroke monocylinder
Cooling Liquid cooled
Bore for stroke 72 x 60
Displacement 244 cm3
Power 36,5 HP
*Max trust 105 Kg with Ø 150 cm propeller
R.P.M. max 8.000
Cylinder Aluminum with Gilnisil coating
Compression ratio 11,5:1
Piston Two chromium plated rings mm 1
Intake Reed valve in the crankcase
Carburetor Polini Ø28 float
Air filter Air box
Ignition 1 Electronic
Ignition 2 Electronic battery powered
Battery charger Output power 80 W at 5500 RPM
Spark plug hood 5k Ω resistance
**Fuel type E5 petrol or LL AV GAS-al with 2,5% synthetic oil 100%
*Consumption 2,9 Lh 30 Kg of static trust
Gear reduction unit Helical teeth in oil bath with 2,8 reduction ratio
Starting Electric starter + Flash Starter
Clutch Centrifugal in oil bath
Muffler Expansion with oval silencer
Engine weight From 18 Kg (without radiator)
Propeller rotation Clockwise

THOR 250 DUAL SPARK engine adapts itself to various application types, as two-seat trikes, powered hang gliders, one-seat small three-axis, ULM motor-gliders, ULM.

  • 928.000.019 –
  • 100% MADE IN ITALY

*The values have been detected on the sea level at standard


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