This thread could be that list!
Wheels - spokes in 1976 and 1977; Comstars in 1978.
Carbs differ - each year is different.
Idle pull-off - 1976 works at all speeds, 1977 and 1978 shuts off above about 16 MPH.
Caster angle - 1976 differs from 1977 and 1978 (which are the same).
Sprockets - 1976 differs from 1977 and 1978 (which are the same).
Plugs - 1976 differs from 1977 and 1978 (which are the same).
Gear indicator - 1976 and 1977 are the same (L for low and D for drive), 1978 differs (1 and 2).
Chain - 1977 and 1978 were o-ring, 1976 was not.
Parking brake mechanism - 1976 differs from 1977 and 1978 (which are the same).
Engine stop switch - 1976 differs from 1977 and 1978 (which are the same).
Turn signal, horn, dimmer switches - 1976 differs from 1977 and 1978 (which are the same).
Brake disc - 1976 and 1977 are the same, 1978 differs.
Speed drive - 1976 and 1977 are the same, 1978 differs.
Front brake hoses - 1976 differs from 1977 and 1978 (which are the same).
Master cylinder - 1976 differs from 1977 and 1978 (which are the same).
Wiring inside handlebars - 1976 only.
Seat - 1976 has a somewhat flat seat, 77/78 have a stepped seat
Handlebars - 1977/78 have higher bars then 76, cables are different length.
Front emblem - 1976 HONDA emblem on forks is different
1977/78 uses a speed warning unit on the throttle opener
1976 uses a fork mounted brake switch, 77/78 is mounted on master cylinder
The Seat has a strange grabrail built in the 1976 model.
1976 model has a 4 into 1 exhaust like a CB750F - 1977/78 has 4 into 2.
1976 kick start lever is unique to 76. However, the 77/78 kick start lever will fit all three years.
more to come . . . .
