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a few days ago i picked up a 79 cb750 for a pretty good deal. it doesn't run but does not need very much at all. Before I order parts, however, i see some differences in some parts between the F and K models. So my first question is which model I have, it says 10th anniversary on the tank if that makes a difference.
 Now, apart from it needing a battery and battery cables, the wires from the starter button seem to be missing, and I cant figure out where they connect, even after looking at the honda service manual. All the wiring behind the headlight seemed petty complete apart from a couple connectors that had a free place for a wire. Those are the only spots I suppose the wires could be connecting to. I will take a picture of those free connectors soon.
Last but definitely not least, when I removed the carbs, I noticed a bit of corrosion on the #4 intake port. As i took a deeper look, there is rust on the valves and guides! Thankfully those valves were closed, and they still opened as i rolled it over. Now I'm pretty sure I would have to brush some rust off before removing the guides so I wouldn't possibly damage the head, but I would also like to hear everyone's opinion on this.
   Thanks for reading! I hope i didnt make this post too long, im new to the forum and wanted to give as much detail as possible so i could get the most straight forword answers.
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Administrator
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If you look at the Ser# on the steering stem, it will say what model it is. There was a special edition 10th anniversary edition K model in 1979, so that could be what you have. If you go to the manuals thread on the homepage here, you can download the factory service manual for free, and it has wiring diagrams that should help. Also since the valves were in the closed position, the rust should not hurt anything.
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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those diagrams are way clearer than the manual i have downloaded. the number on the neck is rc013006164 i got off the title which i made sure matched when i bought the bike
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Administrator
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On the neck it should have the model just before the numbers.
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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there was no marking before the frame number, not even a grind mark as if to remove it. i couldnt find anything on this stamp either
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If it says, "10th Anniversary Edition", or something to that effect, it is the "L" model. It has a few differences from the K model (mag rims, dual front disc brakes, possibly a rear disc brake?), but the engine is identical to the K model, as far as I know. The side cover badges will be different, also. Other than those changes, it is maintained exactly as the K models are.
I had a '79 K. It was a fantastic bike. We rode it, two up, around Lake Superior, in 2009. Bike ran flawlessly. Even though 1979 was the first year for the new DOHC design -- it did not have issues that I know of. Sold mine with 21,000 miles on it because it was dry-rotting in our garage as it got replaced/upstaged by a full-blown touring bike. Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII
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sgtslag wrote
If it says, "10th Anniversary Edition", or something to that effect, it is the "L" model. It has a few differences from the K model (mag rims, dual front disc brakes, possibly a rear disc brake?), but the engine is identical to the K model, as far as I know. The side cover badges will be different, also. Other than those changes, it is maintained exactly as the K models are.
I had a '79 K. It was a fantastic bike. We rode it, two up, around Lake Superior, in 2009. Bike ran flawlessly. Even though 1979 was the first year for the new DOHC design -- it did not have issues that I know of. Sold mine with 21,000 miles on it because it was dry-rotting in our garage as it got replaced/upstaged by a full-blown touring bike. Cheers!
Thanks for the info! The wheels are mag, but single front rotor and drum rear. I cant wait to get it running, im young but I love the way cb's look and the mark in history they have made.
My only worry on how it will run is those valves i posted, i am going to take a look at them at some point and see if i can save myself a lot of work by cleaning the rust off as much as possible. I want to save the guide at least, since I go to MMI and could just cut new seats for valves in class.
I noticed vintagecb750 has lots of parts i will need. what other sites does everyone use for parts? i know there is always ebay. I am just unfamiliar with their shipping and payment systems...just different from what i'm used to seeing
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E-Bay prefers PayPal, which they own... I've used PayPal for over a decade. Only had one incident, and it turned out in my favor. PayPal is basically an online bank. You can transfer money from your traditional bank to your PayPal account, and vice versa. It works off of your registered e-mail account (use separate/different passwords...). It is secure, and it is fast: money is transferred instantly, if it is within your PayPal account; if you don't have it in your PayPal account, they will initiate an electronic funds transfer from your bank account -- takes 2-5 days to complete, at which point the funds show up in the seller's account, and they will post your auction to you shortly after that.
There are a great many vendors who accept PayPal payment. It is my primary method of making payments due to its ease of use, and how widely it is accepted. Otherwise, everybody takes CC's (nearly all Debit Cards are also CC's, so you're covreed).
With regards to parts, I've used BikeBandit.com quite a bit. They have exploded schematic diagrams of hundred's of bikes; they list parts, even those they can't get. I've also found that my local mechanic could still order many parts directly from Honda, for my '79. Around 6 years ago, he said he could still get a complete exhaust system from Honda: $1,800 + S/H! Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII
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Administrator
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For parts, I go to the local Honda dealer first. Then the online parts suppliers. Vintagecb750 is great, then there is cycle-X, Z1enterprises...
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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This post was updated on .
Is the a certain way to take the head off without removing the engine? Do I have to remove the studs? Its late and dark right now and I'm stumped lol. Guess I'll have to try again tomorrow.
EDIT nevermind, after reading the manual more i realized it does have to be removed. back together it goes then. i know i should do the headgasket now that they are separated, but i would rather focus on other areas of the bike for now..
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