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A rear cylinder head cover, left-hand side, made from carbon fibre with a twill weave and an autoclave process. It replaces the original plastic cover as a direct replacement, with no modifications, and retains the standard sound-absorbing material: it brings carbon on show without increasing mechanical noise. On the V4 the rear cylinder head is clearly visible on the side of the bike: replacing the standard plastic with real carbon enhances a technical detail of the engine and coordinates it with the other carbon components. To complete the effect on both sides, the right-hand version (ZA311Y) is available separately.