ROTAX 125 MAX-J125-MINI-MICRO

ROTAX 125 JUNIOR MAX Engine FFSA – National Category

The ROTAX 125 JUNIOR MAX engine is a benchmark in the world of junior kart racing. FFSA homologated in the National category since 2023, this engine offers an excellent balance between performance, reliability and accessibility, making it ideal for young drivers aiming to compete in national championships.

 

Designed by ROTAX, a global leader in kart engine manufacturing, the JUNIOR MAX features advanced technology ensuring great durability and ease of use on all types of circuits.

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Performance and Technology of the ROTAX JUNIOR MAX 

The ROTAX JUNIOR MAX is equipped with a single-cylinder 2-stroke engine with reed valve intake, ensuring quick throttle response and excellent power for the junior category.

Thanks to its liquid cooling system with integrated water pump and digital ignition, the engine delivers consistent performance even in the most demanding racing conditions. The balance shaft reduces vibrations to improve driving comfort and engine longevity.

With a maximum power output of 23 hp at 8,500 rpm and 19 Nm of torque, the ROTAX JUNIOR MAX provides an excellent level of performance for learning and progression in junior kart racing.

Easy Starting and Proven Reliability

The ROTAX JUNIOR MAX engine features an integrated electric starter, allowing quick and easy starts. Its dry centrifugal clutch ensures efficient and reliable power transmission, perfectly suited to the demands of competitive karting.

Its robust design and proven reliability make the ROTAX JUNIOR MAX a popular choice in ROTAX MAX Challenge championships and national competitions.

Technical Specifications of the ROTAX JUNIOR MAX Engine

Engine type: Single-cylinder 2-stroke with reed valve intake
Bore: 54.00 mm
Stroke: 54.50 mm
Displacement: 124.8 cc
Maximum power: 23 hp at 8,500 rpm (17 kW)
Maximum torque: 19 Nm at 8,500 rpm
Cooling: Liquid cooling with integrated water pump
Ignition: Digital
Clutch: Dry centrifugal clutch
Starting: Integrated electric starter
Lubrication: 2% synthetic oil mixture
Weight: 12 kg without accessories

Each ROTAX 125 JUNIOR MAX FFSA engine is numbered and identifiable thanks to its red cylinder head and identification plate, ensuring its homologation and compliance for competition.

ROTAX JUNIOR MAX Engine Kit Contents

The ROTAX JUNIOR MAX engine is delivered complete with all the components required for installation and use in karting:

  • carburetor

  • fuel pump

  • exhaust system

  • radiator

  • hoses

  • battery and battery support

  • charger and adapter

 

This complete configuration allows quick installation and operation on your kart chassis.

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