O.S. Engine 1AW00 Max-21XR-B ver.II Competition Engine  [OS-1AW00]

O.S. Engine 1AW00 Max-21XR-B ver.II: Precision Power for Club and Track

For racers chasing lap-time consistency, the O.S. Engine 1AW00 Max-21XR-B ver.II delivers dependable power and solid build quality. Favoured by experienced hobbyists, this engine combines precision machining with race-oriented features to handle intense track use.

Built for Track Durability

The Max-21XR-B ver.II continues O.S. Engine's tradition of durable race engines. Improved airflow and enhanced cooling lets the engine sustain higher output under sustained load, while rugged construction reduces wear during extended race programs.

Responsive Power Delivery

With a balance of fuel efficiency and sharp throttle response, the 1AW00 Max-21XR-B ver.II produces usable top end and midrange that suit varied circuit layouts. The engine revs cleanly and gives drivers predictable acceleration when pushing for position.

Tuning Tips for Best Results

Maximise performance by matching the engine to a quality tuned pipe and checking needle settings after each run. Routine cleaning and consistent break-in procedures will improve reliability and longevity. Small carb adjustments often yield noticeable gains in throttle feel and fuel use.

The O.S. Engine 1AW00 Max-21XR-B ver.II is a strong choice for racers who want a reliable, tunable engine for competitive events and club racing.