
The TWIN AIR radiator cap 2 bar (manufacturer reference 177903) is a spare part designed for off-road motorcycles. Designed to replace an original cap, it features a nominal pressure rating of 2 bar suitable for cooling systems that require this setting. Ideal for the motocross environment, it is aimed at riders who want to maintain the proper functioning of their machine's cooling circuit.
Examples of models often cited for this type of application: YAMAHA YZ 450 F (2026), SUZUKI RM‑Z 450 (2026), and KAWASAKI KX 450 (2026). Before installation, check the nominal pressure indicated by your motorcycle's manufacturer and the general condition of the circuit (hoses, expansion tank, coolant). This cap is part of regular radiator maintenance and is one of the components to check when preparing for a motocross season or intensive outings on terrain.