The UMS 2-Cylinder 140cc Petrol Twin Boxer Engine delivers smooth, low-vibration 4-stroke performance in a powerful horizontally opposed configuration. Precision CNC-machined from aircraft-grade materials, this 140cc twin is built for reliability, efficiency, and serious scale aircraft applications.

Product Description

The UMS 2-140cc Twin Boxer Engine is a high-performance 4-stroke petrol powerplant designed for demanding scale aircraft and large RC model applications. Featuring a horizontally opposed twin-cylinder configuration, this engine offers excellent natural balance, resulting in reduced vibration, smoother throttle response, and consistent power delivery across the RPM range.

With a 140cc displacement, it produces strong torque and dependable thrust, making it ideal for large-scale warbirds, aerobatic aircraft, and performance-focused builds.

Engineered with precision, the cylinder heads and crankcases are manufactured from aircraft-grade aluminium alloys, providing exceptional structural strength while maintaining optimal weight. All major components are CNC-machined from aluminium and bar stock, ensuring tight tolerances and long-term reliability.

Internally, the engine is built for durability and efficiency:

• Billet aluminium pistons for strength and reduced reciprocating mass

• Hardened steel piston rings for improved sealing and longevity

• Hard-chromed and precision-lapped cylinder bores for reduced friction and enhanced wear resistance

• Hardened steel camshafts for accurate, long-lasting valve timing

The engine operates via spark ignition and includes a front-side magnet ignition system for dependable starting and consistent performance.

Compatible with petrol fuel, the UMS 2-140cc delivers smooth running from idle through to peak RPM, making it a trusted choice for serious enthusiasts and professional builders alike.

Key Features

• 2-cylinder horizontally opposed (boxer) 4-stroke engine

• 140cc displacement with strong torque output

• Naturally balanced configuration for reduced vibration

• CNC-machined aluminium and bar stock components

• Aircraft-grade alloy heads and crankcases

• Billet pistons with hardened steel rings

• Hard-chromed and lapped cylinder bores

• Hardened steel cams for long-term reliability

• Spark ignition with front-side magnet system

• Designed for demanding scale and large RC aircraft

Perfect For

• Large-scale RC warbirds

• Aerobatic aircraft models

• Scale competition builds

• Twin-cylinder full-size style replicas

• Experienced hobbyists and professional builders

Specifications

Engine Type: 4-Stroke Spark Ignition
Configuration: Two-Cylinder Boxer (Horizontally Opposed)
Displacement: 140cc
Bore: 50mm
Stroke: 37mm
Approx. Thrust: 16kgf
RPM Range: 1,000 – 6,000
Weight (with silencer & ignition): Approx. 4.95kg
Head-to-Head Length: 293.6mm
Engine Length: 230.5mm
Recommended Propellers:

• 28×10

• 30×10

Ignition: Front Side Magnet
Spark Plug: CM-6
Carburettor: Walbro
Fuel Type: Petrol

Why Buy from Probuild Aircraft

✅ Official UK stockist – 100% genuine UMS engines
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