SOHC.co.uk Forums > CB500/550
1976 550F
petebog:
Ah, more good info! Cheers for the help with this So got another look at the bike at lunchtime. The black/white feed to the coils is connected ok but when I was checking it I noticed the front mounting bolt on the coils which also holds an earth connection was missing the nut. Managed to find a nut to put on it and put it back together with recharged battery. So now it's cranking over reasonably well (with the headlight switch on but not otherwise) and I've also got a spark from the old nail. Still no hint of it wanting to fire though. There is fuel getting through because it started coming out the overflows. Then the battery went flat again and it started to rain so I called it a day.
This is what the switchgear looks like. L/h looks original to me? R/h looks like pattern part?
I've ordered a new battery and I'll try some fresh fuel in it tomorrow just in case that makes any difference. The guy I got it off did say it had been running a few months ago but I'm not sure how many can still count as a few..
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deltarider:
Brown wire in US models is blind, as they didn't have the position light the other markets had.
The green wire goes on that bolt now sticking out of the frame, but you probably knew,
Orange/white and lightblue/white were for the extra running lights in the indicators. Not on Europe models.
Bryanj:
You should not need to have the lights on for it to start so the wiring is suspect and to be honest i would start by disconnecting every thing in the shell(or the box if wires go there) and start again connecting colour to colour
petebog:
Yeah I’ve reconnected the earth to that bolt and put duct tape over the ends of the wires that aren’t needed just to make it obvious that they aren’t. I had been starting to think myself it might be a good idea to just disconnect everything and try and identify all the wires with my masking tape method and then put it back together again properly. Seems to me that might be the easiest way to figure it out. The other thing I’m starting to notice is that things seem to be done up just barely tight. The nut had fallen off the bolt at the front of the coil, but the one at the back was really only just finger tight, same with the screws holding in the headlamp shell. The master cylinder has been leaking just where the pipe is bolted on so that obviously wasn’t tight enough, and today I also noticed it looks as if the pipe has been leaking at the other end too where it bolts into the calliper. So really I just need to go over the whole bike and check everything before I’d be confident to ride it, but then I suppose that should go without saying for a bike that hasn’t had an mot since 1997! The thing is it all looks nice so you tend to assume things are ok.
deltarider:
--- Quote from: Oddjob on June 10, 2020, 05:02:14 PM ---... and where does the black wire go to? black is power and that seems to be headed towards the carbs, no idea what that's doing...
--- End quote ---
There's one blind black wire on mine in the same position. It has to do with differences in wiring concerning the horn. Step one should be to have the appropiate wiring scheme for your model. Wiring scheme differs with 'area code'. So before step one, determine what model you have. This can bedone by comparing your engine- and framenumbers with those listed in the first few pages of the CB550 parts lists. They are all here: http://www.honda4fun.com/materiale-documentazione-tecnica/parts-list/parts-list-cb550 When you have determined your model and its area code (!), we can then select the appropiate wiring scheme.
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