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.


Seriāls "Paramotori" 1. sērija

Seriāls "Paramotori" 2. sērija

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Polini Thor 250-Thor 250 DS

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.

Technical data

Polini Engine2 stroke monocylinder
CoolingLiquid cooled
Bore for stroke72 x 60
Displacement244 cm3
Power36,5 HP
R.P.M. max8.000
CylinderAluminum with Gilnisil coating
Compression ratio11,5:1
PistonTwo chromium plated rings mm 1
IntakeReed valve in the crankcase
CarburetorØ28 float
Air filterAir box
Ignition 1Electronic
Ignition 2Electronic battery powered
Battery chargerOutput power 80 W at 5500 RPM
Spark plug hood5k Ω resistance
Fuel typeLead free petrol with 2% synthetic oil
Gear reduction unitHelical teeth in oil bath with 2,8 reduction ratio
StartingElectric starter + pull start with self winding rope Flash Starter
ClutchCentrifugal in oil bath
MufflerExpansion with oval silencer
Engine weight18,5 Kg (19,5 kg with electric starter) without radiator
Propeller rotationClockwise

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