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HIRTH engine
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Hirth-F23LW engine
The new F23 “lightweight” matches the power of the standard F23 engine...
The new F23 “lightweight” matches the power of the standard F23 engine, but achieves a higher power-to-weight-ratio by utilizing a lightweight crankshaft, generator-flywheel and recoil starter. When used in conjunction with the new G23-reduction gear (also “lightweight” in comparison with the predecessor) it delivers a power unit which sets world classic standards in its power-to-weight, performance and reliability.
The new F23 “lightweight” weighs 22 kg, which is 2 kg less the standard F23 design. This makes this engine an excellent choice for light aviation devices that weigh up to 120 kg which come under prt. 103 “legal”-rule in the USA.
The new F23 “lightweight” is available with a diaphragm carburettor, slide carburettor or electronic fuel injection. Options include dual ignition and electric starter.
The F23 “lightweight” achieves a max. power of 50 hp at 6500 rpm and torque of 53 Nm at 6300 rpm. It also achieves a service life of 1000 hours and utilizes Nikasil-coated aluminium cylinders and a digital ignition system. Combine this with a 3 year warranty on the crankshaft and this lightweight engine achieves performance and reliability unmatched in the industry.

Technical data

Specification subject to change without prior notice

Type:

Two cylinder two stroke(boxer)

Displacement:

521cm3(31.8 cu in)

Stroke:

64mm(2.52in

Bore:

72mm(2.83in)

Max. performance:

36.7kW(50HP) at 6500rpm

According to DIN 70020


Carburation:

Slide carburetor (Mikuni) (AS), Diaphragm carburetor (Mikuni) (BS), Multi point injection (ES)

Ignition System:

CDI

Generator Power:

250W12V

Cooling:

Free air

Weight:

22kg(48.4lb)(without exhaust)

Starting device:

Recoil starter

Running direction:

Counter-clockwise, view to output shaft

Fuel mixture:

Mixture 1:50, 2-stroke-oil, fuel min. 95 octane (RON) Mixture 1:80-100 with BLUEMAX 2-stroke-oil, fuel min. 95 octane

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