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I was wandering if someone could help me with a problem I had today with my 1977 CB750. I bought this bike 5 days ago, nice shape with 26,000 miles on it. I was riding today, and was going to make a right hand turn at the next intersection. I turned my blinker light on, it beeped three times and everything shut off. No lights, no power, no nothin'! I'm not familiar with this bike yet to know where the main fuse is located, but from what I have read, it is behind the left side cover. Could this be a blown fuse or something else? If it is a blown fuse, what would cause it to blow and why have I ridden all week and not have any problems? I would appreciate any info and advice from others whom have experienced such problems in the past. Thank you.
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Administrator
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Welcome to the forum. You have come to the right place. The fuse blocks on these bikes are junk! The connections on the back side of them are weak, and will not carry the amps. this causes the fuses to over heat, and blow. to cure this. Just replace the fuse block, by cutting the wires off at the back, and then wire in 3 blade type fuse holders. These can be obtained at any auto parts store, and even Wal-mart has them. Then on the main instead of using a fuse, use a 15 amp circuit breaker. that way if something does trip it; all, you need to do is turn off the switch, for a few seconds, and it will reset.
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)
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Thanks TOOLS1 for the info. Turned out that the trouble was with the 15 Amp fuse, but it wasn't blown. Just years of fatigue and vibration must have caused some sort of break down inside the fuse itself. Put in a new 15 Amp fuse and it came alive....no more problems. Your idea of putting in new individual fuses sounds like the way to go. That may be a winter time project for the future. Thanks again!
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I like that Idea! Especially the circuit breaker I'm doin it. 
 ---1976 CB750F CAFE---
Florence, Colorado
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that is a gudun about the circuit breaker.
With my opinion and your knowledge, we can change the world.
KEEP YOUR FISTS UP, FOR BALANCE AND PROTECTION!!!
i like fat chicks
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Administrator
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Yeah as these bikes age, those buss fuse blocks corrode and weird things happen. Mike is still good but I have cleaned the contacts. Some time I will replace them but I am saving up to do a partial refresh since my head gasket is starting to go.
The ride IS the adventure. The destination is just to get gas!
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Administrator
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What is the problem with the head gasket? If it is oil leaking from the fins it is the nut covers under the camshaft.
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)
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Administrator
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It could be those. I honestly have not looked that closely yet. I kinda want to refresh and yet dont. It would be my first engine I have torn apart like this, besides a briggs! I doubt it is too hard but finding parts is a serious pain as you well know with having an A.
The ride IS the adventure. The destination is just to get gas!
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Administrator
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There is a guy on e-bay selling Athena gasket sets, for $50.00, and vintage has the rings. I would run a compression check before tearing it apart. The head bolt covers are about $8.00 a set.
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)
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Administrator
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Oh man...Re-Run, I thought you were the guru when it came to these bikes!!! :-)
So, there's no Santa Claus, no Easter Bunny, and now this. :-) :-) :-)
Time to git 'r' done.
Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.
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Parts for the CB750 engine are not hard to get.
The more parts you order the more that will be available.
You know how these businesses are these days... If they do not sell
the item within a few days they take it off the shelf.
One day I bought a box knife and a week later i went back to get more blades and
I could not find them.
The clerk (associate), told me they did not carry the blades for my cutter anymore.
I said can't you request to get more blades and the clerk said,"no only the corporate office
people decide what gets ordered." I said OK give me my money back for the knife.
Then it got ugly.LOL Idiots.
On a Roadstar Adventure.
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Administrator
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that works if things are in bulk and demand.
Try finding 1 source for in and ex valves, keepers, springs, guides, seals, ect.
I have yet to find 1 source for all of these. Keepers are especially hard to find for the 77/78 engines.
Well, luke, I just had to let you down I guess! Gotta keep the expectations realistic!  I am sure it wont be to hard though.
The ride IS the adventure. The destination is just to get gas!
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