The 500T had a higher flow oil pump as well. Some of the bottom end was redesigned.quote:Originally posted by borzwazie
The differences between the 450 and the 500T are mostly aesthetic.
There are some differences internally in gearing and the head (porting I think) and the bore, but most other parts bolt on without a fuss.
The other difference was that the 500T exhaust had that crossover chamber.
Those torsion bar valve springs are neat. There's a certain order you can swap them around to get move valve seat pressure if you want to run higher revs. But the cam followers already have oiling problems and gall/pit easily. The followers work on the cam/valves at a bad angle, meaning they wear quickly. And if you hard coat them, it just means your cams wear faster.