Hello, Please HELP my 2018 yz450f has a problem, when bike is wide open it falls  on its face, almost like the rev limiter kicks in extra early  or extra strong, has anyone ever had this problem,  ive  tried checking valves,  cleaning throttle body,  new map sensor, cleaned fuel injector, cleaned fuel pump, everything works, as it should  up to wide open,  wide open bike makes a flat sound..  whats  next,,  could it be it needs a top end..  bike has 73  hours.. Please HELP

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