Try taking the cable out from the gearbox end and the speedo end. check that when you turn one end of the inner cable the other end turns, if it doesnt then the cable is the problem. as you sound like a technical guy then i am sure you know that.
i would suspect that it is the gear that drives the cable in the gearbox. a rather wacky but effective way of testing this is to remove the cable fromt he speedo end. hold it in your hand and roll the bike down hill whilst looking at the free end of the cable, if the inner rotates then the chances are it is the speedo or the connection at the speedo. if it doesn't then the little plastic gear is not driving the cable so look down at that end. whilst not wishing to sound patronising, are you 100% sure that you have assembled the speedo drive mechanism. let me know how you get on.
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hiya speedo drive is electrical no cable fly by wire but dont no where pulse would come from av u any ideas thx
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