I've thought about this before, too(not planning on doing it, but just as a kind of thought experiment). Seems like you'd have the best of both worlds, but I might be mistaken.
If you only changed the rear sprocket to, say, a 43 tooth but left the front as a 15, would that pretty much eliminate the need for first gear (might also make it really "jumpy" on takeoff and give it a little more power uphill)? Also, would the RPMs at the top end run the risk of causing damage to the engine? I really don't know too much about this kind of thing.
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