1976 CB550F "Barn Find"

Re: 1976 CB550F "Barn Find"

It looks like it's in reverse order. But I have the wires connected up to the proper coils
 

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Are any of your connections on the points making contact with the plate? I had a similar issue when timing my GL and found when I had tightened up the nut on the wire it spun a bit and bent the connector to make contact, it was grounded all the time and I spent way too long trying to get the light to go out on one cylinder until I found that, adjusted it and then everything was good.
 
You could just swap the yellow and blue leads and see if that fixes things. It is possible that the points cam is on 180 degrees out where it fits on the advance weights.
 
Re: 1976 CB550F "Barn Find"

Maritime said:
Are any of your connections on the points making contact with the plate? I had a similar issue when timing my GL and found when I had tightened up the nut on the wire it spun a bit and bent the connector to make contact, it was grounded all the time and I spent way too long trying to get the light to go out on one cylinder until I found that, adjusted it and then everything was good.
It doesn't seem like it's grounding out... But I'll continue chewing on that.
 
Re: 1976 CB550F "Barn Find"

teazer said:
You could just swap the yellow and blue leads and see if that fixes things. It is possible that the points cam is on 180 degrees out where it fits on the advance weights.
I'll give that a go. The advance weights are the spring loaded bobbit behind the points plate attached to the cam right? Maybe I put it on the wrong way? How could I tell?
 
I think they have a line on the cam that has to be up at a certain TDC. An easier way is to bring the motor up to TDC valves closed on #1 and see where the cam is. If the points are just breaking open for 1-4, you are OK. If they are wide open, the cam is upside down.
 
Re: 1976 CB550F "Barn Find"

Do you see anything wrong with this?
 

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Re: 1976 CB550F "Barn Find"

Just flipped the lobe. P1-4 start the light at f1-4
 
Re: 1976 CB550F "Barn Find"

Gap too loose and points opening way too early?

Don’t run fuel from that tank through your carbs until you sure if it’s a liner/if it’s in good shape. Pour fuel in it and run it into a bucket through a strainer or something see if there are any chunks in there. If all looks well run a good inline filter.

If they’re over flowing then float height could be off, needle valves or seats could be bad, floats could have holes in them. Are the bowl drains closed?


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Re: 1976 CB550F "Barn Find"

She lights up far before the f mark though. at the notches ahead of the mark. No amount of swivel seems to change it to bring it closer to the f.
 

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Re: 1976 CB550F "Barn Find"

john83 said:
Gap too loose and points opening way too early?

Don’t run fuel from that tank through your carbs until you sure if it’s a liner/if it’s in good shape. Pour fuel in it and run it into a bucket through a strainer or something see if there are any chunks in there. If all looks well run a good inline filter.

If they’re over flowing then float height could be off, needle valves or seats could be bad, floats could have holes in them. Are the bowl drains closed?


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the points are set to .35mm as indicated in the manual.

Ill double check the carb drain plugs, and ill follow your advice on the tank drain as well. Thanks!
 
snmavridis said:
Guys. I think that did it.

Good. That cam was 180 degrees out.

Static, the light should go on at the T (TDC) mark not F (Fire/Full advance).

If that picture is just as the light goes on, it's retarded, rotate the backing plate slightly to the left so that it goes on right at the mark and then fire it up and set it at full advance with a strobe.
 
Re: 1976 CB550F "Barn Find"

teazer said:
Good. That cam was 180 degrees out.

Static, the light should go on at the T (TDC) mark not F (Fire/Full advance).

If that picture is just as the light goes on, it's retarded, rotate the backing plate slightly to the left so that it goes on right at the mark and then fire it up and set it at full advance with a strobe.
What he said.


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Re: 1976 CB550F "Barn Find"

Well, now we wait for the battery to charge...
 
Re: 1976 CB550F "Barn Find"

Ok, it seems like my 1-4 points are not grounding properly. Light stays on over two rotations. On 2-3 they work as expected. Occasionally the light will switch off, but then the light pops on and stays on again for a few rotations. I read on another forum that one person solved it by grounding the engine. The engine is attached to my frame and I have a ground attached to the frame. Still chewing on this. But if you guys have any input it would be greatly appreciated. If anything this build thread can help out a bunch of other idiots who apparently don't know what they're doing
 
The light should come on as the points open and should go off when the points close again. If it is staying on, that suggests that the set of points is not closing or is not making a good connection. Try cleaning the points and make sure the ground wire from engine to frame is not on a painted part and is actually making a complete connection.
 
Re: 1976 CB550F "Barn Find"

teazer said:
The light should come on as the points open and should go off when the points close again. If it is staying on, that suggests that the set of points is not closing or is not making a good connection. Try cleaning the points and make sure the ground wire from engine to frame is not on a painted part and is actually making a complete connection.
Stop me if I’m wrong but the 2/3 points working properly is a sign that the engine has a good ground. No?
I would think that the problem is isolated to the 1/4 points. As Teazer said, perhaps they are not closing or not making connections.


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^^^

That makes sense. I gave the points a quick one two with 500 grit sand paper and sprayed them with contact cleaner. Maybe I left some particulates on the pads. Busy day today, will report back over the weekend. Thanks for all your help guys!
 
Re: 1976 CB550F "Barn Find"

I said fuck it to the chores. Wiped off the pads again, cleaned the spot where the point was sitting, and she's working as expected! Not sure if it was a grounding issue persay, but a thorough cleaning did the trick. Now she's statically timed up. Oh boy!!!
 
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