Valach Engines

VM R5-250

  • Nickel-Silicon plated cylinder surfaces
  • Fully encapsulated valve train
  • CNC milled crankcase, cylinders and cylinder heads
  • The VM R5-250 comes with a light weight ring muffler made from Stainless steel
  • The VM R5-250 comes with a radio controlled electric fuel pump
  • Radio controlled ignition switch integrated in the ignition module
  • Valach microprocessor controlled ignition with auto advance and retard
  • Spontaneous throttle response and smooth midrange transition
  • Honda valves and valve seats
  • Walbro HDA 48 carburetor
  • VM-engines are being produced with state of the art machines and methods
  • Rapid spares delivery and repair service from Germany by Toni Clark practical scale GmbH.

The Valach VM R5-250 is a four stroke OHV engine with two valves per cylinder, running on petrol/oil mixture. Valves and their seats are manufactured by Honda, ensuring a very high quality. The fully encapsulated valve train reduces sound as well as keeping dust and dirt away from the rocker arms.

A special safety feature is built into the microprocessor controlled ignition. It senses a rapid RPM rise of more than 3000 RPM in less than one second, should this happen during starting the engine. It will shut off the ignition immediately and give out a warning signal, you then can restart the engine – at a lower more save throttle setting.

The Valach VM R5-250 radial is designed and built soundly in the Valach tradition. Crankcase, cylinders and cylinder heads are CNC milled using a high grade aluminium alloy.

Image: Gerhard Reinsch of Toni Clark practical scale is flight testing and perfecting the Valach VM R5-250 Prototype and pre production engine. It was done during 2017/18 with the above Grumman F3F-2.





250 ccm


42 mm


32 mm


301 mm

Length from engine mount to prop hub

194 mm

Weight engine

5.597 g

Weight engine complete with ringmuffler, engine mount, electric fuel pump and ignition

6.050 g

Ignition voltage range

6 - 9 Volt

Idle RPM

6.000 1/min

Fiala 2-blade Prop





Fiala 3-blade Prop




All prices in EURO including 19% German VAT. We reserve the right to alter prices and specifications without prior notice.

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