1977 The Honda Express (NC50) is introduced.
1979 The Express II (NA50) is introduced alongside the Express. Both feature the same drivetrain, but the new model is built with a redesigned frame and larger seat.
1980 Turn signals and a larger battery to match are added.
1981 Both models see a series of improvements, including an automatic choke unit, a more rugged kick starter to replace the wind up starter, and a solid state Capacitor discharge ignition in place of the contact breaker based system. The Express II also receives an automatic two-speed transmission.
Also new in 1981 is the Express SR (NX50). This is a scooter variant of the Express with a somewhat modified engine. It is the first Express to feature an electric starter, 12v electrical system and a Honda V-Matic continuously variable transmission.
1982 The Express receives a new frame design and the two speed transmission seen the previous year on the NA50. The Express II model is dropped, and a new model called the Urban Express (NU50) takes its place. This model features a frame similar to the NA50, and a drivetrain identical to the Express SR's, outside of its transmission gearing and electric starter. The Urban Express Deluxe (NU50m) is the same as the standard model, but comes with an electric starter and larger battery to operate it.
1983 This is the final year of the Express series in North America. The NC50 remains unchanged from its previous year. The Express SR is no longer available.
1984 This is the final year of the Express series in the United Kingdom.
Just a little info on the chronology of the Express... for those interested
