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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.
The 500T had a higher flow oil pump as well. Some of the bottom end was redesigned.

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.
 

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both the 450 and 500 twins had the torsion bar spring heads. Neat stuff. Real 1960's Formula 1 car racing stuff. But they got the rocker arm angles all wrong.

Funny, because these bikes were designed in the era of Honda's 17000rpm inline 3,4,5,6 cylinder bikes.
 
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