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Author Topic: 78 CB550 full rebuild  (Read 6089 times)

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Offline flatlander

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Re: 78 CB550 full rebuild
« Reply #25 on: October 24, 2015, 01:06:34 PM »
what do you mean exactly? they don't go all the way down in the threads, or they're in but keep turning (stripped threads)?
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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #26 on: October 24, 2015, 01:12:39 PM »
They are in but keep turning so I guess that would be stripped threads. Is there a way to fix that?


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Offline flatlander

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Re: 78 CB550 full rebuild
« Reply #27 on: October 24, 2015, 01:51:30 PM »
yes, look for an M6 thread repair set. most common brand is helicoil. they come with a drill bit, thread insert, and a tool to get the insert into the new hole. basically you drill out the stripped thread and replace it with a coil that forms the new one.
no need to despair - you can fix that :)
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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #28 on: December 09, 2015, 03:20:11 PM »
Hey guys, I am back at it and have a strange electrical issue. It has to do with the turn signals and tail light. If I turn on the right turn signal both right lights and the tail light flash. If I turn on the left turn signal the left rear and tail light flash and the front right turn signal flashes dimly. Unplugging the brown wire from the tail light prevents it from flashing. Any ideas?


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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #29 on: December 09, 2015, 05:39:15 PM »
I figured it out, it was a dirty switch. Now my issue is that I don't have running lights on the front (as I recall the turn signals would act as running lights), the speedo and tach lights dont work and the tail light only works when I push the brake lever. It seems that all of these have one thing in common and that is that they should come on with the ignition switch, so could the problem be the switch? Is there a way to test that?
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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #30 on: December 09, 2015, 05:52:09 PM »
Fuses are all new. Starting left to right this is what I get on the meter tail=0 head=0 main=12.65 blank=13.5 blank=0


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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #31 on: December 09, 2015, 05:53:57 PM »
The headlight was unplugged so with it plugged in head=.15


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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #32 on: December 09, 2015, 06:08:27 PM »
Does this look right?


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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #33 on: January 03, 2016, 12:05:29 PM »
Ok everyone, I need some help. I got it back together finally and tried to start it today. Attached is a video of the attempt. Does anyone have any ideas from the sound it's making? I know it's a long shot but I figured everyone has helped a lot here already.


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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #34 on: January 03, 2016, 12:32:29 PM »
Another find


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Offline Tews19

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Re: 78 CB550 full rebuild
« Reply #35 on: January 03, 2016, 03:09:21 PM »
Cam off a tooth??? Wow that sounds really weird and bad.
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1969 Honda CB750... Basket case
1970 Honda CB750 survivor.

Offline Trad

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Re: 78 CB550 full rebuild
« Reply #36 on: January 03, 2016, 09:29:21 PM »
I agree. Somethings out of time or order, man.
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74 CB550 Build: NOS-GUTTED-OEMplus-HOLDTRUE
http://forums.sohc4.net/index.php/topic,130575.0.html

Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #37 on: January 04, 2016, 03:51:17 PM »
Is there a way to check the cam chain placement without pulling the cam cover?


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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #38 on: January 04, 2016, 04:15:04 PM »
I did that and had the same thing happen. I'm gunna check the valve clearances next.


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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #39 on: January 04, 2016, 05:35:30 PM »
Rechecked the valve adjustments, they seemed to be opened and closed when they should be and spacing seems right. Also tried switching the wires with no change. Does this mean it's time to start tearing the motor apart? Any other ideas?


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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #40 on: January 04, 2016, 06:05:25 PM »
From what I recall the notch was facing the front of the engine, which I believe is right. Is there a way to confirm that without taking the cam cover off?


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Offline sboubel

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Re: 78 CB550 full rebuild
« Reply #41 on: April 16, 2016, 11:56:08 AM »
Hey guys, it's been a while. I'm back on this project and took the cam cover off to check that I had everything right and I believe I do. Here are some pics...anyone see anything wrong? Piston 1 is all the way up as shown with the screwdriver, the timing it on t 1-4, and the notch in the cam is facing toward the front of the bike. Any suggestions? I'm not a mechanic so I really don't know where to go from here. There is a video in this thread of the symptom I have.

Thanks everyone!




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