Hey all 78' Cb750k new to forum

Previous Topic Next Topic
 
classic Classic list List threaded Threaded
49 messages Options
123
Reply | Threaded
Open this post in threaded view
|

Hey all 78' Cb750k new to forum

xghandix
Let me start by saying I have been lurking these forums for a few weeks now. I am all so proud to say I have not needed to ask a single question. I know nothing about motorcycles, but I found this thing in a basement and offered a guy $400.00 for it. Bike would fire but not idle. I used the information on this forum to rebuild the carbs. Bike is running amazing now. Here is some pictures. Thanks for all the awesome guides. TOOLS you are the man! Feel free to comment.


Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

TOOLS1
Administrator
I'm sorry. I feel like I have gotten you into this mess, so how about I just give you your $400.00 back for it, and we will still be friends?
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)
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

xghandix
Ha!! Isn't she pretty....I'm thinking of maybe painting tank and fenders a matte black with a candy red pin stripe. Not sure how I would like the flat black with the clear coated frame. Any opinion?
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

TOOLS1
Administrator
I think the paint that is on it is pretty cool.
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)
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

xghandix
I'll take another picture of the face of the tank later....it's not so cool...Has a giant "Christie Sue" on it...
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

TOOLS1
Administrator
xghandix wrote
 "Christie Sue"
LOL
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)
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

xghandix
as promised.

Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

TOOLS1
Administrator
Have you ever heard of stickers?
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)
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

xghandix
Not sure if you are insinuating that it's a sticker but it isn't.
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

TOOLS1
Administrator
No. Put a sticker over it.
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)
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

LukeM
Administrator
Duct tape.
Hooker Headers sticker.
Sunflower decal.
Peace sign sticker.

Steel wool applied back and forth, erasing the name.

Too many other options to list here.
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.
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

xghandix
ahh, I might do something...Idk what I would want to put on it...maybe a nice big zombie haha, or the AIR HOLE panda.
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

TOOLS1
Administrator
Zombie's are cool. Or how about a "National Grape Popsicle Week" sticker?
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)
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

Re-run
Administrator
In reply to this post by xghandix
Wanna make a nice but quick change on the front end? Take off that little fender brace that goes to the back of the front fender. Took mine off and it was crazy how a small thing like that made such a big change in looks. Also, it doesn't affect handling or fender operation.

Doesn't really go with the black fender anyways!
The ride IS the adventure. The destination is just to get gas!
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

xghandix
I was thinking this sticker as a good cover.
I'll check out the fender thing tomorrow. I think the only change I want to make are the bars and seat. Seat is to small for my big ass. Any suggestions on a quality comfy seat of the same style.
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

TOOLS1
Administrator
You could just tell people that it was supposed to say "Christ Saves" and the painter messed up.
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)
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

xghandix
I think I'll pass on that one haha.
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

xghandix
Figured you guys would like to see what my bike looks like now.

It's running a lot better than what it was.

Still having throttle response issues. I can also see the accelerator pump squirt gas through all 4 when the carbs are off the bike. Only the middle two fire when the carbs are on the bike. Any heavy twist of the bike below 3k rpms will kill it. Above 3 RPMS it will try to die and restart itself, almost as if you were to unpause it. To lean?  Any suggestions?
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

Re-run
Administrator
Looks like you removed that little fender brace. How do you like the look?

It does sound like it is too lean. But you say only the middle 2 fire. That could indicate an ignition problem as 1 & 4 are on the same point/coil.

I would turn off your fuel and pull the plugs and lay them against the fins and try cranking the bike over. Make sure the run switch is on. You should get spark from all 4. 1/4 are on 1 coil, 2/3 on the other. Verify you have strong blue spark. I would also double check timing and point gap.

If ignition seems ok, then move onto carbs. Low idle stumble can be from plugged idle jets. Only real way to clean them is to pull them from the carb bodies. You can do this by putting a bit of rubber/cloth/something thick enough to not tear easily and offer some grip. Grab with pliers and pull them out. You may have to twist and pull. Just make sure you do not  move them side to side, that is when jet seats get cracked. I have done this method on my carbs many times with no problems. Just be careful and you should be fine.

Once out, use a strand or 2 of copper wire and clean every hole. Then spritz with a bit of carb cleaner. Beware, the cleaner will shoot everywhere so protect your eyes. Or do it in a rag.

Make sure every hole is open.

Without knowing more about the what you have done, I could give the whole clean carbs lecture. But you can put the jets back in if you want. I would also lightly seat your idle mix screws and then turn them back out 1.5 - 1.75 turns.

Another question is what air filter you are running. Pods make things pretty lean. I have had good luck with K&N filters in the airbox.

Just checked and I see there are, or were, pods on the bike. Definitely turn out screws 1.75 turns to start with.

Give us more info and we can give you more tips.
The ride IS the adventure. The destination is just to get gas!
Reply | Threaded
Open this post in threaded view
|

Re: Hey all 78' Cb750k new to forum

TOOLS1
Administrator
In reply to this post by xghandix
If the accelerator pump is squirting all 4 carbs with the carbs off the bike, it should be squirting all 4 on the bike. Unless you somehow plugged two nozzles while installing the carbs. On the running problems, what you describe is all caused by a vacuum leak. Your boots between the carbs and head are most likely dried out and not sealing.
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)
123