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I wonder if the statement about the oversize top sprocket is correct? seems that the lower sprocket is 1/2 the size of the top sprocket. If the top sprocket was larger then 2x diameter after a few revolutions the timing would be off. yes?




No, it has nothing to do with the sizes of the sprockets, it has to do with the number of teeth. As long as the top sprocket has twice as many teeth as the bottom sprocket and the chain pitch is close enough to fit, the cam will turn at half the speed of the the crank.

They can add to the diameter of the sprocket and the pitch of the teeth only changes ever so slightly. I imagine the top sprocket is also easier to hold to machine.




According to their web site its a matched set and
have to be used together....