Author Topic: 1977 CB550  (Read 21318 times)

Offline Valentinik

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Re: 1977 CB550
« Reply #15 on: January 13, 2016, 08:10:46 PM »
My Ignition switch arrived today. So i hooked a battery up and tested everything. Everything seems to work, the only issue i can see if that the rear light is constantly on. The light switch has no effect on its operation, when the switch is moved the light flickers ever so slightly but nothing more.

Is there anything i could look at that may be causing it?

Thanks
Mike

Offline MCTID

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Re: 1977 CB550
« Reply #16 on: January 13, 2016, 08:21:31 PM »
If its a Canadian Bike (or perhaps a US Bike supplied to certain States) the lights are often linked to the ignition.....i.e. Ignition On = Lights On.

I had a Suzuki GT500 which I bought new in 1976 when I lived in Canada and that always ran the lights as soon as the Ignition was switched on........I had no problems with that set up but if I remember correctly it was the law at the time in Canada.

Worth looking into......maybe a UK market switch might solve the issue.
Now: CB750K4. 1970 Bonneville. Various other 1960's 650 Triumph T120's/ TR6's/ TR6C's. Previous: CB1300 (2). ZXR1200S. VFR800. CB750 Nighthawk. CX500. XS500 Yam. Suzuki GT500. BSA A10. Various Lambrettas. Zunddap Bella (honest).

Offline Valentinik

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Re: 1977 CB550
« Reply #17 on: January 13, 2016, 08:29:57 PM »
Thanks, that thought did cross my mind. Il take a look. When the switch is unplugged the light also stays on, i don't know if this makes any difference?

Mike

Offline Oddjob

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Re: 1977 CB550
« Reply #18 on: January 13, 2016, 11:19:11 PM »
Check the fusebox, someone may have inserted a spare fuse between 2 of the fuses, the light should always go out when the key is removed unless there is a short somewhere between the parking light and main circuit wires.
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Offline Valentinik

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Re: 1977 CB550
« Reply #19 on: January 13, 2016, 11:22:44 PM »
Sorry i didnt phrase it very well. The tail light goes out when the ignition is turned off, but it come straight on when the key is turned.

I presumed it should only come on when the light switch is used? Or am i mistaken?

Mike
« Last Edit: January 13, 2016, 11:30:16 PM by Valentinik »

Offline Oddjob

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Re: 1977 CB550
« Reply #20 on: January 14, 2016, 05:35:32 AM »
Does the small pilot light come on in the headlight as well? it may be that for some reason the PO cross wired it in the headlight shell so that it would come on when the ignition came on, however the front pilot light should also come on as it's on the same circuit. I'm fairly sure it's a UK bike but it may be an import, does it have a frame plate anywhere with year of manufacture on it?

Just spotted the frame plate by the seat lock, can you show a pic of it? also one of the right hand handlebar switch as that should show if it's designed to run with lights on.
« Last Edit: January 14, 2016, 05:38:27 AM by Oddjob »
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Offline Valentinik

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Re: 1977 CB550
« Reply #21 on: January 14, 2016, 05:34:39 PM »
I haven't got any lights on in the headlamp.  I've now disconnected all of the plugs in the headlamp and when the ignition is switched on the tail light still illuminates. So the connection must be elsewhere.  I've attached a picture of the frame plate and headlamp switch





Mike

Online hairygit

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Re: 1977 CB550
« Reply #22 on: January 14, 2016, 06:34:31 PM »
It could be that a previous owner had a break in the loom somewhere, and rather than sort it properly has bodged a new wire or supply to the tail light, which is live all the time the ignition is on, with no way of switching it off ( seen it done a few times over the years) If it is an issue to you, do a thorough inspection of the entire loom and all it's connectors, looking for any odd/unusual looking bits of wire or strange connectors like the dreaded scotchlocks!

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Offline Oddjob

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Re: 1977 CB550
« Reply #23 on: January 14, 2016, 06:40:43 PM »
Well the frame plate looks like the UK version, no date of manufacture as required by the US market. Light switch also looks to be UK model, original handlebars as well  :) as they have the dot stamped in them to orientate the switches (in case you don't know the split in the switches goes level with the dot punched into the bars, they'll be others near the bar clamps to get the position of the bars correct as well)

If all the plugs in the headlight are disconnected the tail light must be getting it's power from somewhere as it's not getting it from the handlebar switch as standard, stupid question but your not putting the ignition switch on the park position? will the key come out when the lights on? what colour wires are going to the tail light? IIRC there should be a brown, green and green/yellow, the brown is the tail light, the green is the earth and the green/yellow is the brake light. There should be a brown connector in the headlight for the pilot light in the headlight to connect to and also some brown/white wires which is the lighting circuit for the speedo/tacho etc.

I strongly suspect that the fuse box is the problem, remove the fusebox and check the back of it for corrosion, not uncommon. I would suspect there is some corrosion between the centre and one of the end fuses, try removing them one at a time and see if the light goes out. The tail light gets it's power from No3 fuse which will be one of the end fuses, if you remove this fuse and the light stays on then it's a clear indication it's getting power from somewhere else and that's probably the centre fuse.
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Offline Valentinik

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Re: 1977 CB550
« Reply #24 on: January 14, 2016, 09:04:26 PM »
Thanks for the info both, I checked the fuse box, it looks very clean, no corrosion. The only time the light goes off is when this fuse is removed:



If either of the other fuses are removed the light stay on.

I then stripped all the tape off the loom and found no wires spliced that shouldn't have been. The only issue i found is the positive feed from the solenoid to the mulitplug that feeds the main loom, the red 12v+ wire was quite corroded and broke while i was examining it. I may replace these with modern waterproof connectors in the seat pan I'm going to fabricate.

I doubt this would be causing the problem with the light. To sum up, the light operates with nothing plugged in, only the main loom connector to the solenoid and the ignition switch, in the on position, not P.

Mike

Offline Valentinik

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Re: 1977 CB550
« Reply #25 on: January 15, 2016, 08:27:07 PM »
I made a start on stripping the engine down to try and limit any damage from any water. Tonight I got the head and cylinder removed, so far I'm pretty pleased with what i've seen. The bores look to be pretty good with no visible scoring or lips, so I'm hoping i can use it without a rebore. The only bit of damaged i've found so far is a slight mark on one of the pistons.











You can see the damage in the circle. After i've got it all stripped down and inspected i want to get the cases painted/powdercoated, is there a preferable way to clean the crankcase. Vapour blasting, etc?

Mike

Offline Valentinik

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Re: 1977 CB550
« Reply #26 on: January 18, 2016, 08:01:18 PM »
The logbook for the bike arrived today. Which pleased me as the seller never had it when i purchased the bike, against my better judgement i bought it anyway (after doing a HPI).

Anyway, i made a little progress tonight.  I never mention when i started the topic that I'd like to go with a brat style with the bike. I know its not to some peoples taste but i've always liked that style of bike.

With that in mind, i started on removing some of the brackets from the frame that i won't need. Side panel mounts, battery tray mount,etc.

Before


After


I only got one side done as it was getting late but hopefully tomorrow i will finish the other side off. Im not sure yet if I'm going to cut the rear of the frame slightly and weld an upswept hoop in like this:



Or just remove the bridging section between the 2 sides weld a brace in to mount the seat to.

Mike

Offline Valentinik

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Re: 1977 CB550
« Reply #27 on: January 19, 2016, 08:43:08 PM »
I got the brackets cut off the other side this evening:





I've just got a few smaller sections to tidy up and then i can cut the bridge at the back. I also got an impact screwdriver and undid all the bolts from the clutch housing, so i can carry on with stripping the engine.

Offline Valentinik

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Re: 1977 CB550
« Reply #28 on: January 20, 2016, 09:22:26 PM »
A question: I've read a lot of topics on keeping the standard airbox and filter. Seeing as i don't have the airbox and the carbs i buy will need rebuilding/rejetting to suit the engine. Other than having to rejet the carbs which i would have to do anyway is there any other issue with using pod filters instead of the standard airbox?

Thanks
Mike

Offline Norniron

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Re: 1977 CB550
« Reply #29 on: January 20, 2016, 10:50:08 PM »
A question: I've read a lot of topics on keeping the standard airbox and filter. Seeing as i don't have the airbox and the carbs i buy will need rebuilding/rejetting to suit the engine. Other than having to rejet the carbs which i would have to do anyway is there any other issue with using pod filters instead of the standard airbox?

Thanks
Mike
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