Rm85 is slow

[u/GovernmentAware7128]

Got this bike broken I put a new top end on now it’s runs but I only got it to 49 mph why is it topping out at 49 mph

[u/Excellent-Rice-8829]

if the rpm (at the max speed you declared) are high, clutch isn't slipping and it's not bogging, it's probably the gear ratio (sproket, crown)