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The single cylinder engine of the SP-55 series is designed with twin spark plugs and can be equipped with a carburetor or a fuel injection. The rear output shaft and the position of the carburetor or the fuel injection on the side, make this engine to one of the most compact 1-cylinder engines on the market. Because of the rear output shaft, a generator can be mounted on the back of the engine. All fuel injected engines are equipped with the ignition HKZ215 and the ECU030.


  • SP-55 TS ROS 

  • SP-55 FI TS ROS

  • SP-55 FI TS hybrid 

  • SP-55 HF FI TS ROS (available upon customer request)

> TS – Twin Spark, FI – Fuel Injection, HF – Heavy Fuel,

ROS – Rear output shaft, CR – Carburetor Rear

The SP-55 FI TS ROS is the smallest 1 cylinder engine with rear output shaft in the Sky power portfolio. A twin-spark single-cylinder system and our with the EFI version also our smallest fully integrated ECU managed system offering full hybrid functionality.

Speed Range:
Oil/Gasoline ratio:
Operating Voltage:
1-Cylinder Gas Engine
55 ccm / 3.35 cu in
SP-55 TS = 2580 gramm / 5,69 lbs (incl. ignition)
SP-55 FI TS ROS = 3500 gramm / 7,72 lbs
(incl. ignition, ecu, fuel pump)
2000 - 10000 RPM (depending on version)
4.18 HP / 3.1 KW
4 ball bearings
1:50 / 2% mix
6 - 8.4 V DC
Test method: Dynotest – Engine data might change due to the engine test procedure and the engine configuration.
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