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b20b dizzy - vacuum RETARD ???? 140-160 1970

Sure, I won't argue with any of that -- it clearly depends on which dizzy you have, so whatever works correctly is fair. I have not myself had a model with as much centrifugal advance as that, measured in crankshaft degrees -- the retard units I've had were all the older iron-bodied type. (They're long gone, I couldn't give you the part numbers.)

But to get back to the point of the thread, there is NO performance or economy advantage in using vacuum retard at all. I say if you have one, leave it disconnected.






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