Only 5,980 were produced in a year and a half. Kihachiro Kawashima, who retired as executive vice-president in 1979, remembered the bike as a "splendid failure": it was too expensive, the engine overheated, the FRP body was heavier than expected and made the bike underpowered and clumsy, the new cantilevered suspension was problematic, and customers did not like the motorcycle-style clutch operation.
The final Juno KB model can be distinguished by enlarged rear vents and new vents added to the windscreen.
Technology developed for the Juno K would be applied to later bikes. The electric start was re-introduced with the C71 Dream in 1957, and the new Plastics department under Shozo Tsuchida developed polyethylene components that would distinguish the Super Cub.
The Juno M80/M85 was a different approach, introduced in November 1961. Unlike the K-series, there is no upper windscreen, the engine is an exposed horizontal-twin rather than an enclosed fan-cooled unit, and the body construction is conventional monocoque steel rather than FRP panels over tube. The M80/M85 also introduced a clutchless Badalini-type hydraulic-mechanical transmission which would provide the basis for the later Hondamatic motorcycle transmissions.
The M80 and M85 are essentially the same vehicle, with the M85 designation indicating a mid-year engine enlargement. The Juno was discontinued by year-end with only 5,880 produced.
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