O.S. Engine OS-13941 21XM Version II Competition Buggy Engine  [OS-13941]

O.S. Engine #13941 - 21XM Ver.II
Price:
AUD$706.89
Brand:
O.S. Engine
Model:
OS-13941
Condition:
Brand New
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Track-Proven O.S. Engine OS-13941 Power

The O.S. Engine OS-13941 delivers a compact, performance-focused package for RC car and buggy use. It is engineered to give a stable power curve and reliable behaviour under load.

Tuned Internal Geometry for Smooth Output

With a 3.46cc displacement, this unit produces 1.3ps at 25,000 RPM. The 16.6mm bore and 16.0mm stroke have been chosen to balance peak power with manageable midrange response.

Flexible RPM Range for Different Circuits

Covering 3,000 to 25,000 RPM, the OS-13941 adapts to varied track types so drivers can tune for torque or top speed depending on layout demands.

Low Mass Construction to Aid Agility

Weighing 670g, the OS-13941 helps maintain nimble handling and brisk acceleration, making it suitable for competition and spirited club runs.

Specifications

  • Displacement: 3.46cc (0.211 cu.in)
  • Output: 1.3ps at 25,000 RPM
  • Bore: 16.6mm (0.654in.)
  • Stroke: 16.0mm (0.630in.)
  • Weight: 670g (23.6oz.)
  • Practical RPM Range: 3,000 - 25,000 RPM

The O.S. Engine OS-13941 suits drivers who prioritise a compact engine with predictable high-RPM characteristics and durable construction.

What pipe and muffler work well with this engine?

A tuned pipe matched to the OS-13941s powerband will improve top-end and throttle response; check length and resonance recommendations for your setup.

How should I set idle and high speed needles?

Start with the manufacturers baseline settings, then richen or lean the high-speed needle in small steps while monitoring plug colour to reach optimal mixture.

Does the engine need any special cooling modifications?

Standard cooling fins and correct head torque normally suffice; if running in very hot conditions consider improving airflow to the engine bay.

Is the OS-13941 suitable for sprint and endurance formats?

Its balance of durability and power makes it viable for both short sprint events and longer runs, provided regular maintenance is observed during endurance use.

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