I just redid the front forks on my 400 with new honda seals and 150ml each honda ss10 fluid, I know its a sport bike but they don't even seem to budge when going over bumps. An old honda dealer mechanic told me that when they were new people would complain and they just drained out some of the oil because the stock amount was too much, and after they rode a lot smoother. Is it worth a try ?