It (ie using a helmet dizzie) is if you use the earlier camshaft, but why would you? That would seem to be a backward step to me. But I suppose if that is what the assembler had to hand.
I went the other way, from a helmet to a crab dizzie with no problems: I don't remember having to use an adapter or change the timing gear cover, as I think the bolt holes lined up (but it is 20 + years ago now!)
Mike
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