O.S MAX-B21 1/8 Off-Road

The OS MAX-B21 is the new engine developed by the Japanese to cover the mid to high range. It's the direct successor to the 21XR-B and 21XZ-B models, and all their users will appreciate it because OS has gone all out with this new model. Specially designed for 1/8 nitro Offroad, the OS MAX-B21 engine is truly versatile and easy to use. This engine will set a standard, benefiting both beginner users and experienced pilots alike. It offers excellent value for money, and its ease of tuning will make life easier for many pilots.

Based on the top-of-the-range O.S.SPEED engine series, it features a perfectly balanced combination of smoothness at low RPMs and good power at high revolutions. This will help us to pilot more comfortably without power peaks and also ensures that we won't lack power in any situation.

With the new cylinder head, weight reduction has been sought to achieve better performance. Additionally, the shape of the combustion chamber of the cylinder head has been revised to improve combustion efficiency and response at low RPMs, resulting in truly moderate fuel consumption. Intensive work has also been done to achieve an engine that is easy to tune.