Vintage and Classic Hondas › Repair sources and write-ups. Do not ask questions here.

80 750F Electrical Issues -Bad Rotor..

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Half-Caf
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80 750F Electrical Issues -Bad Rotor..

Half-Caf
So, I went a little deeper into my electrical problems tonight. Following cheesehead's thread, I'm 99% certain that the issue is with the rotor. My stator looked good when I tested it with the ohm meter and the battery is new, so I think I can rule that out. When I checked the rotor with the ohm meter, I got absolutely nothing.



However, I did notice a couple things when I took off the stator cover. First, I saw some small bits of cable shielding fall out. And second, I noticed that the copper wire from the coil had a loose end. Could either of these be an issue?




Whatever the case, looks like I need a new rotor. I saw a bunch on ebay for 70's cb's, but I am not sure how compatible they are. Any buying tips or places I should check out?
The best things in life are custom
Youtube: http://www.youtube.com/user/halfscb
1980 cb750f SS
Chicago, IL
TOOLS1
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Re: 80 750F Electrical Issues -Bad Rotor..

TOOLS1
Administrator
You need one from a 70-83 model. I would recommend ebay, or post on the forum that, you need one.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
Half-Caf
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Re: 80 750F Electrical Issues -Bad Rotor..

Half-Caf
Hmm, looks like the end plate with the two copper rings is not actually part of the rotor? Is that right?
Most of the ones I've found on ebay do not include this. Should I try to replace the whole thing as a package?
The best things in life are custom
Youtube: http://www.youtube.com/user/halfscb
1980 cb750f SS
Chicago, IL
TOOLS1
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Re: 80 750F Electrical Issues -Bad Rotor..

TOOLS1
Administrator
I have not done much with the DOHC models, but I think that is all one assembly.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."

1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
cheesehead
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Re: 80 750F Electrical Issues -Bad Rotor..

cheesehead
If you need the honda tool that separates the rotor from the crankshaft so you can remove it, let me know. I'll mail it to you and you can mail it back. It's just a little bolt looking thing that you screw on a couple turns WITH THE BIKE IN GEAR and whack with a hammer.
1981 CB750k  -  SOLD it and regretting it!

Eastern Ohio, Tri-State Area
Half-Caf
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Re: 80 750F Electrical Issues -Bad Rotor..

Half-Caf
Well that's very kind of you, but I already picked one up a while back.
Currently waiting for my new rotor and rectifier / regulator to come in the mail.

If you'd like to see my progress, check out my build thread.

By the way, I see you're in the tri-state area. I am living in Chicago now, but I grew up in Erie, PA
The best things in life are custom
Youtube: http://www.youtube.com/user/halfscb
1980 cb750f SS
Chicago, IL
cheesehead
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Re: 80 750F Electrical Issues -Bad Rotor..

cheesehead
That's cool, I took the kids up to splash lagoon in Erie last summer and had a blast. I'm actually pretty far south in Steubenville, though, just west of Pittsburgh. Ya, I think I paid $17 for it and I'll probably never use it again, lol.
1981 CB750k  -  SOLD it and regretting it!

Eastern Ohio, Tri-State Area
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