• Valach VM 420 R5
  • Valach VM 420 R5
  • Valach VM 420 R5
  • Valach VM 420 R5
  • Valach VM 420 R5
  • Valach VM 420 R5

Valach VM 420 R5


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Valach 420cc R5 radial gas 4stroke engine with electronic ignition and electric fuel pump incuded - This motor has been designed from the ground up for fuel pump usage, the Fiala/APS fuel pump is already included (US$250 value).


  • Cylinder:  5
  • Displacement:  420 cc
  • Output:  ca. 25 hp
  • Bore:  47 mm
  • Stroke:  48.5 mm
  • Diameter:  425 mm
  • Length from engine mount to prop hub:  255 mm
  • Weight:  11.8 kg
  • Ignition voltage range:  6 - 9 V
  • Idle RPM:  800
  • Max RPM:  4500
  • Propeller size:
  • Fiala Prop 2-Blade: 38x24" to 42x20"
  • Fiala Prop 3-Blade: 36x24" to 40x18"


Click for Dimensions






Valach motors were designed with Fiala props in mind. Should you want to run the  shown pitch and diameter recommendations you WILL need to run a Fiala prop. Should you want to run props of a different brand you will most likely have to drop 2 in pitch due to Fiala's unique airfoil choice. Other brands plain run at a higher drag rate.


Very convenient to have as the Valach does not come with preinstalled throttle and choke horn: