2024 Zx4r Top Speed. As mentioned, the 399cc engine produces a claimed maximum output of 74.8hp (55kw), the figure chiming in at 14,500rpm, but the ram air system pushes this a smidge further to 77hp (56.7kw). Bell race star flex dlx:

Based on feedback from racing activities, the assist & slipper clutch uses two types of. As mentioned, the 399cc engine produces a claimed maximum output of 74.8hp (55kw), the figure chiming in at 14,500rpm, but the ram air system pushes this a smidge further to 77hp (56.7kw).