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Rotax 503 UL DCDI 50HP Aircraft Engine

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503 UL
24 Hours
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Product Description

Rotax 503 UL DCDI 50HP Aircraft Engine
  • 2-stroke engine specially developed for recreational aircraft
  • 2 cylinders, cooled by fan
  • Piston ported intake
  • Dual capacitor discharge Ignition (DCDI)
  • Dual Bing carburetors
  • Mikuni pulse driven diaphragm fuel pump
  • Recoil or electric starter
  • Available with various exhaust system configurations
  • Operates on automotive fuel with a minimum of 87 octane rating (Canadian standards) and super 2-stroke oil of API-TC classification, automatically provided by oil injection, or premixed with a 50:1 ratio
  • Challenger owners, we make the installation of oil injection possible!
  • Time Between Overhauls (TBO): 300 hours


Maximum power 49.6HP / 37.0kW
@6500 RPM
Maximum torque 41.3ft-lb / 56NM
@6000 RPM
Maximum RPM 6800 RPM

Combustion chambers

Bore 2.84" / 72.0mm
Stroke 2.40" / 61.0mm
Displacement 30.31cu.in. / 496.7cm³
Compression ratio Theoretical: 10.8
Effective: 6.2


Engine with carburetors 73.2lbs / 33.2Kg
Exhaust system 11.2lbs / 5.1Kg
Air filter 1.1lbs / 0.5Kg
No gearbox, no electric starter 85.5lbs / 38.8Kg
B gearbox,
no electric starter
95.4lbs / 43.3Kg
B gearbox,
electric starter
106.2lbs / 48.2Kg
C gearbox,
no electric starter
103.1lbs / 46.8Kg
C gearbox,
electric starter
113.9lbs / 51.7Kg
E gearbox 110.2lbs / 50.0Kg

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Product Reviews

  1. Rotax 503

    Posted by Scott Middlemist on 14th Jan 2023

    Good product. Good company. Good and fast service. Very satisfied. Will continue doing my business with company. 5 Stars

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