All the Stock Honda spigots as well as a few aftermarket ones I saw had a step at the exit - I knew from my testing on KZ that you get a good top end increase by eliminating that step
such that the spigot end is a sharp edge. I spent most of one night in the tent at Vegas with a drill and a round file modifying one for morning warm up.
The data showed near on 300 rpm extra down the shute - the result was the first Stock Honda win for us.
By the next year I had my own CNC made ones with no steps at all.
Haha Jan - I wonder who the clever dick was at Aprilia who thought long stroke was the way to go.
Ive got a thing thats unique and new.To prove it I'll have the last laugh on you.Cause instead of one head I got two.And you know two heads are better than one.
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