Polini THOR 250 engine features a liquid cooling system, that grants an extraordinary steady power output and better performance at every rpm.
Thor 250 engine is small and very compact with a great power/weigh ratio.


Seriāls "Paramotori" 1. sērija

Seriāls "Paramotori" 2. sērija

Seriāls "Paramotori" 3. sērija


Polini Thor 250-Thor 250 DS

The die cast light-alloy aluminium cylinder grants a better thermal stability. The liner with Nickel-Siliceous coating improves the piston sliding, its resistance to wear and abrasion. 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. The advanced technology and the great performance of the new THOR 250 gives a better feeling when driving making the flight even more performing, dynamic, reactive, beside granting more stability. THOR 250 is provided with a balancing countershaft; this feature cancels the vibrations and guarantees such a driving comfort never felt during a flight and a better engine lasting.
Polini Motori deeply directed its attention to the security matter too. THOR 250 is in fact provided with a centrifugal clutch entirely in oil bath, with a mechanical gear with helical teeth. The counter revolving rollers considerably decrease the upsetting torque-steer for a further flight comfort.
The hand starter is easier thanks to the flash starter device, which speeds up and simplifies the movements. THOR 250 engine distinguishes itself for many other advanced solutions, as, for example, the comfortable closed circuit system for the fuel recovery during transportation and the 12V output for any eventual electrical use. A version with electric starter is also available as optional. The engine has already confirmed its extraordinary performance features during the tests made on the test benches by the engineers of Polini Motori.

Technical data

Polini Engine2 stroke monocylinder
CoolingForced air
Bore for stroke64 x 60
Displacement193 cm3
Power30 HP
R.P.M. max8.100
CylinderAluminum with Gilnisil coating
Compression ratio12:1
PistonTwo chromium plated rings mm 1
IntakeReed vale in the crankcase
CarburetorWalbro / Polini Float Ø28
Air filterAir box
IgnitionElectronic with battery charger possible
Battery charger prearrangementOutput 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
StartingPull start with self winding cable Flash Starter – Electric starter (optional)
ClutchCentrifugal in oil bath
MufflerExpansion with oval silencer
Engine weight17,5 Kg (18,5 with electric starter)
Propeller rotationClockwise

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