Couple of 2007 Zenns around here. In 2007 bolt-on converters and hotter lightweight batteries were coming... and coming... and coming... then Zenn factory quit.
I may buy one but Zenns never got over 25 m.p.h. - my old City-EL from Germany would do 50 but they warned not to go over 35 (I ignored instructions). Zenn probably has a governer or a limiter in the controller.
It would be neat if they had speed computer chips like some of those hot rod cars. Does anyone make hop-ups for Zenn?
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