RM125FSi - four stroke inline 2 cylinder

incl. 19% VAT excl. shipping to Germany / Deutschland
Article number: 2365.000 (H)
Article code: 2365.000
Manufacturer: RM-Motoren

2359.00 € Limited availability
Limited availability

available stock: 1
Amount pcs

The Roto 125 FSi is a new engine for inline engine aircraft. The design of the engine was aimed at easy installation in an aircraft with a narrow fuselage. Engine performance is comparable to 125cc four-stroke engines, low idle and easy starting is a given.

The engine has been developed with all the experience provided from the Roto - UAV development group and meets the highest possible standards of production quality and output testing.

The Roto 125 FSi is a twin cylinder, four stroke, air cooled inline engine with a single carburettor for ease of user setup. The engine is completely built on roller bearings and is completely maintenance free. Engine lubrication is provided by a system adopted from Roto - UAV and no relubrication is required. The valves and their gears are developed so that their inspection is not necessary before 40 hours of operation.


  • Engine displacement: 125 ccm
  • Power: 7 HP
  • Max static engine thrust: 21 kg
  • Bore: 2x48 mm
  • Engine weight: 4300 g
  • Engine & ignition weight: 4580 g
  • Arrangement of the engine: inline two-cylinder
  • Cooling: air-cooled
  • Lubrication: petrol 95 oct. + 2% oil
  • RPM: 1100 – 6000
  • Fuel system: Carburettor

Recommended airplanes models:

  • Acrobatic: Up to 3 m
  • Scale/Sport: Up to 4,5 m

Recommended propeller:

  • 2 BLADE: 28/10 up to 30/14
  • 3 BLADE: 26/10 up to 28/12

Scope of delivery: -ROTO 125 FSi: 1x

  • Ignition: 2x
  • Exhaust pipes: 2x
  • Waste oil hose: 1x
  • Spark plug key CM6: 1x
  • Cable tie: 4x
  • Silicone tube: 2x


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