Join Date: Oct 2009
Location: Gilbert, Arizona, USA
The '76 has the kick start still, and that reserve lighting system is mounted under the left hand tank side as you sit on the bike. The wiring harnesses are different. The brakes and wheels are different. Seats will fit. The light module that tells you if the lights are out or indicates turn signals is different. Gauges are different, but basically the same. The speedometer for the '78 has some little gizmo in it for the turn signal buzzer, which isn't a necessary item,and the '76 doesn't, and the Tach for the '76 has a temp gauge in it that the '78 tach does not have. Fuse blocks are in different locations. (I personally think the '76 location is better than the '78-'79 location.)
The side covers are different shapes. The timing proceedures are the same for both earlier and later engines.
The '78 times at 10ºBTDC and the '76 times at 5ºBTDC. You don't really have to know that however.
The carbs are different '78's are smaller. '75-'77 has a bit hotter cam. Valve lift is the same and so is the setting of the valve gap. Point gap is the same.
The frames are slightly different shapes, but all the mounting points for the engine are in the same locations so the engines can be switched if need be. Same radiators.Same shrouds around the radiators and the heat shield between radiator and carbs is the same.
You can interchange the heads, but do both of them at the same time.
Timing belt is the same, although I have seen different numbers for them, but only from Mama Honda. Same fuel pumps.
Tanks look to be the same shape also.
The faux tanks are different. I haven't tried to put the one from my '76 on my '78 so I don't know if that can be done. Nice thing about 'Wings is they don't have to be there to run the bike, so you could always fabricate your own.