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Author Topic: 1972 cb500 trials and tribbleations  (Read 5074 times)

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Offline DanEarl

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Re: 1972 cb500 trials and tribbleations
« Reply #25 on: May 26, 2009, 02:45:48 PM »
when it starts acting up, like at a stop light, does it run any better if you turn off the headlight?  that would be charging system...  also check your float heights.  should be 7/8" or 22mm
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Offline JS550

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Re: 1972 cb500 trials and tribbleations
« Reply #26 on: May 26, 2009, 03:24:02 PM »
As far as the front brake, have you tried to adjusted it? You might be able to open it up a little to stop the dragging.
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Offline Quorthon

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Re: 1972 cb500 trials and tribbleations
« Reply #27 on: May 26, 2009, 03:38:42 PM »
Quote from: DanEarl on May 26, 2009, 02:45:48 PM
when it starts acting up, like at a stop light, does it run any better if you turn off the headlight?  that would be charging system...  also check your float heights.  should be 7/8" or 22mm
Haven't noticed this.  I just automatically turned it off the few times I killed it and it was out of juice.   It may have helped.
Quote from: JS550 on May 26, 2009, 03:24:02 PM
As far as the front brake, have you tried to adjusted it? You might be able to open it up a little to stop the dragging.

Haven't got around to rebuilding it yet. Not sure how to adjust it?   Is it the bolt with the spring on it?
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Offline JS550

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Re: 1972 cb500 trials and tribbleations
« Reply #28 on: May 26, 2009, 03:59:12 PM »
Yep. You loosen the lock nut & turn the screw with a flat tip. You should be able to back it out. The brake is working though? Just dragging?
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Offline B.O.X.N.I.F.E.

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Re: 1972 cb500 trials and tribbleations
« Reply #29 on: May 26, 2009, 04:31:43 PM »
Hang in there, I'm still picking away at my 550 that was in about the same condition.

unrelated to your problem, is that a 750 points cover?
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Offline Quorthon

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Re: 1972 cb500 trials and tribbleations
« Reply #30 on: May 26, 2009, 04:46:38 PM »
Quote from: JS550 on May 26, 2009, 03:59:12 PM
Yep. You loosen the lock nut & turn the screw with a flat tip. You should be able to back it out. The brake is working though? Just dragging?


Yeah it works fine, just dragging.  The brake light does not work with the front brake though.   I will try adjusting it, but I think it needs the rebuild anyway, because when I pull it in all the way it is not completely locked.


Quote from: boxnife on May 26, 2009, 04:31:43 PM
Hang in there, I'm still picking away at my 550 that was in about the same condition.
unrelated to your problem, is that a 750 points cover?

I think so, PO did that.   I believe they have the mounting bolts in different places.    Thanks for the support!



Also, I am embarrassed to ask this, but where the heck are the fuses located?   I can't find a single one with the tank on, are they under it?
« Last Edit: May 26, 2009, 04:50:44 PM by invisibleX »
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Offline number13

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Re: 1972 cb500 trials and tribbleations
« Reply #31 on: May 26, 2009, 05:03:13 PM »
There is only one fuse, supposed to be located
on the electrical panel on the left side.


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Offline Quorthon

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Re: 1972 cb500 trials and tribbleations
« Reply #32 on: May 26, 2009, 08:42:41 PM »
New revelations!

Just checked for the fuse,  and there isn't one!  WTF!  Looks like someone has swapped the motor at some point and completely bypassed it.  Ugh. :-[   

So I guess I need to add one somewhere?  Luckily all the wiring is conveniently wrapped in electrical tape, haha.

Heres a picture:

Front:

The bottom plug is also unplugged here.  No chance that that is what connects to the charging system!?


Back:



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Offline TwoTired

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Re: 1972 cb500 trials and tribbleations
« Reply #33 on: May 26, 2009, 09:16:24 PM »
That thing above the red tape with a black wire going into it in the last picture is a fuse holder.
In the top picture, the black tube above the turn flasher and below the solenoid is a fuse holder.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline Quorthon

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Re: 1972 cb500 trials and tribbleations
« Reply #34 on: May 26, 2009, 09:30:38 PM »
Haha, ok, that was dumb....

I'll check that.


Do you know what the bottom left wiring plug is?
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Offline TwoTired

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Re: 1972 cb500 trials and tribbleations
« Reply #35 on: May 26, 2009, 10:23:19 PM »
Quote from: invisibleX on May 26, 2009, 09:30:38 PM
Do you know what the bottom left wiring plug is?

Which picture?  Describe the wire colors for the plug you have a question about.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline JS550

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Re: 1972 cb500 trials and tribbleations
« Reply #36 on: May 27, 2009, 07:04:14 AM »
I'm suprised TwoTired didnt point out that the fuse holder has "FUSE"  on the cap!
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Offline Quorthon

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Re: 1972 cb500 trials and tribbleations
« Reply #37 on: May 27, 2009, 05:47:31 PM »
Quote from: JS550 on May 27, 2009, 07:04:14 AM
I'm suprised TwoTired didnt point out that the fuse holder has "FUSE"  on the cap!

Haha....


I figured out what the wiring is.


I came out this morning to find a giant puddle of gas under the bike. The gas is coming out of the rubber connection between the 2nd carb and the airbox, there is a hole there.

I turned the gas off yesterday and yet it seems to still be flowing fine?  Why would the gas be getting pulled into just that carb?   Why doesn't it come out the overflow?

Bag petcock?  And?
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Offline TwoTired

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Re: 1972 cb500 trials and tribbleations
« Reply #38 on: May 27, 2009, 06:44:21 PM »
Is the overflow plugged up?  Is the drain tube?
  Pull of the hoses on the fuel selector.  Does it leak when off is selected?
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline Quorthon

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Re: 1972 cb500 trials and tribbleations
« Reply #39 on: May 28, 2009, 11:14:29 AM »
Going out to do this now.



In the mean time, I have a multi meter I recently bought.   How do I check the rectifier with it?
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Offline Quorthon

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Re: 1972 cb500 trials and tribbleations
« Reply #40 on: May 28, 2009, 02:05:43 PM »
Quote from: heffay on May 28, 2009, 11:56:07 AM
damn... I totally thought this was gonna be a Star Trek thread.   ;D ;) ;D

Glad someone got it.  Haha!

Any advice with the multimeter?
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Offline TwoTired

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Re: 1972 cb500 trials and tribbleations
« Reply #41 on: May 28, 2009, 02:06:48 PM »
Use the diode test function if you have one.  Saying you have a multimeter is like saying you have a motorcycle.  Unless they see it or you tell them, no one will know which kind you have, or any of it's features.

However, to check your rectifier's six diodes, you have to perform 12 measurements.
Green to each yellow, both lead polarities
Red to each yellow, both lead polarities.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline Quorthon

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Re: 1972 cb500 trials and tribbleations
« Reply #42 on: May 28, 2009, 02:24:41 PM »
Here is my multimeter.   Is this the correct setting?

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Offline TwoTired

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Re: 1972 cb500 trials and tribbleations
« Reply #43 on: May 28, 2009, 03:17:55 PM »
Not sure.  Most digitals have a special setting for diodes, one that puts enough voltage on them to activate.  This is usually something you don't want when checking circuit boards and their function.
The symbol is kinda like this    --<|--

If all your diodes show open circuit with both polarities, you'll have to find another meter to test them.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline TwoTired

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Re: 1972 cb500 trials and tribbleations
« Reply #44 on: May 28, 2009, 04:11:56 PM »
One more thing, if you have a second multimeter, you can measure the voltage the one in the picture puts into the circuit being tested, set yours to ohms, and the second to volts. 

To measure a diode you will need just over .7 v to activate the diode in the forward direction and make it conduct.  This will give a low reading on the meter.
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Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline Quorthon

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Re: 1972 cb500 trials and tribbleations
« Reply #45 on: July 19, 2009, 06:06:33 PM »
So, I have a cracked intake boot that needs replacing.   I was planning to switch to pods anyways, so now would be the obvious time.


However I still don't have it running quite right yet and I wanted to keep it stock until it is.   Just don't want to spend the money on a part I will be replacing soon anyways.


Whaddayathink?
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