Since changing to the 450f from the 250f the only downside is the super heavy clutch, not that i use it much. Left arm fatigue is definitely a factor. I had a stroke of genius in the shed and tinkered with the idea of running a return spring on the clutch, not a super storng one, just enough to assist and make it lighter in action. Thoughts appreciated !!!!!!! and of course some funny smart arse comments too.