1981 CB750K - Repair/Tune-up

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Re: 1981 CB750K - Repair/Tune-up

bosco39
Yup, that's what the majority of people (who get points on that) do -- they start off too close to the inside line, effectively tightening up the curve by a LOT and don't make time. It's amazing how getting your riding line right will be a TON faster. That outside-inside-outside path of travel makes a big difference. I even drive my pickup like that now. =)
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
Ahh, that makes sense.

Carbs are totally rebuilt, sans being put together. Need to get vaseline to make putting the tubes in easier. And get the choke rod from TOOLS so I can do the 3/4 choke.

And then I can install it and fire 'er up!
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
Hey, does anyone recognize this? It fell off when I put the brake-side of my rear tire down. I'm changing out the sprockets right now. I'm ready to put the tire back on, but I don't see this part in any illustrations, drum brake or rear tire assembly. Not sure if it was a left-over, or if I'm just not seeing it.

Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

TOOLS1
Administrator
That goes in the break arm on the drum. Then the rod goes through the small hole.
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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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
The adjusting rod, from the pedal?
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
and I just answered my own question... yes!

Thanks a LOT TOOLS! Seriously, you're definitely a brilliant guy when it comes to these things.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

rrgunslinger
In reply to this post by cdaiscool
That goes in the rear break lever. The one the rod goes to. The rod goes through it then the adjustment nut.  Just make sure you put the rod through the hole before you bolt the drag bar to the break hub.:)

On Wed, May 9, 2012 at 3:25 PM, cdaiscool [via Honda CB750'S] <[hidden email]> wrote:
Hey, does anyone recognize this? It fell off when I put the brake-side of my rear tire down. I'm changing out the sprockets right now. I'm ready to put the tire back on, but I don't see this part in any illustrations, drum brake or rear tire assembly. Not sure if it was a left-over, or if I'm just not seeing it.

Turbos, Hondas, 4-bangers, what could go wrong?



If you reply to this email, your message will be added to the discussion below:
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American by birth. Cowboy by choice! Vero Beach, FL http://i373.photobucket.com/albums/oo172/grandpaslinger/HD%20Road%20Glide/IMAG0046.jpg
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool


I love this forum. Definitely some good people on it.

I'm on other bike-specific forums but this is the only one I really visit. Thanks guys!

Off to throw the rear tire on, and start trying to fix everything else. Gotta hit the store today to get my air filter, too. And doing the spark plugs. And swapping out the switch if I can find where they terminate.

I'm hoping my choke bars show up tomorrow... then I can install the carbs and fire 'er up! I'll get video for all you guys following my stuff.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
So, I'm having some carb choke issues (damn things - why can't I just put my hands around its throat and choke 'em that way??). The butterflies won't close all the way under spring pressure. They will when I move the arms manually. But not by the choke cable holder.

The video I made to demonstrate:


Guide I'm using:

http://www.cb750c.com/publicdocs/SeanG/Honda_Carb_Manual_revD.pdf

I'm about to start page 34. Any clues, I could use 'em. I'm hoping once they're buttoned up they'll start working. But I kind of doubt it.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
So, after the bars which hold the carbs on completely, the choke works as expected. I gotta learn patience...

So I think we're good, I'm working on the bench sync right now. I've found that I have this spring left over. Nothing like "Hey, we're good!" going wrong when you see a spring left over. Any thoughts? The fuel bracket here is just there for size comparison. I know where it goes, the instructions have that go on after the bench sync.

Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
Oh, and that's not a throttle spring that goes between 1/2 or 3/4. Those are on already, and are fairly smaller than this.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
Well, I hope it's not important. I think I know what it is, though, I think it's an accel pump spring, and was replaced when I put the new rebuild stuff in.

Carbs are on the bike! And then I twisted the throttle. And found out that I put the cables in backwards. So she throttles when the handle's twisted forwards. If I wanted something different, she works awesome! But, alas, I don't. So remove them I will.

After dinner. Currently have to get food with my Grandma as a going-away thing. Goal for tonight: fire it up. Goal for tomorrow: complete sync/set-up, ride for several hundred miles. Let's see this get done.

To-do list:
-Spark plugs
-Put front sprocket cover back on
-Finish up install of carbs
-Mess with the tuning/synchronization/etc of carbs
-New petcock into tank
-Install in-line fuel filter
-Install sissy bar
-Put seats, tank on
-RIDE IT.

I have a busy 1.5 days ahead of me...

Also, a HUGE thank-you to TOOLS for getting me what I needed to finish up the carbs. Without him, I'd be getting pissed at my carbs, trying to heli-coil or re-thread those mini bars.

I'm making a Giveaway thread tonight, for anyone that needs parts off these carbs. I'll part it out and give 'em out to whomever needs 'em. Shipping's on me. Just let me know what you need. Note: there's no choke bars, bowls, or jets. And the vacuum pucks do NOT move. They are frozen.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
I'm getting close to firing it... it should fire tonight yet. Fuel tank is on my dumpster, fuel line is ran from tank to carbs. Carbs are tightened to the intake boots. Not to the air filter, but that can happen tomorrow.

Question, though. There's a vent T that goes between Carbs 2 and 3. What is this supposed to go to, where's that hose go?

I have all other vacuum sources and such resolved. This is just for this one. Not sure where that one goes.

Spark plug wires are installed, carbs are bench sync'd perfectly, and I'm just looking for my key now. That, and I'm waiting for my roommate to get out of work so she can film while I start 'er up.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
I LOVE THE SEARCH FUNCTION! And this site...

http://honda-cb750-s.456789.n3.nabble.com/Mysterious-quot-t-piece-quot-between-carbs-on-81-CB750K-td3691494.html

It's a vent to nowhere. I'm leaving it as-is for the moment. Now time to put the final touches on getting 'er running. Expect video tonight before I go to sleep.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
Arghhh. She doesn't want to fire. She spins oh-so-fast, and a couple times with the choke closed she WANTS to fire, she spits REAL quick, but that's it. Largely nothing.

:/

Any suggestions? Perhaps the fuel bowls aren't full enough yet? Any suggestions on how to prime the carbs before trying to start 'er again?
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

TOOLS1
Administrator
Try starting fluid, or squirting some gas into them, but I doubt that will cure it. There is a problem somewhere.
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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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
since I also did the spark plug wires, I'm wondering if I butchered the wires.

Hmm. Time to go do some troubleshooting. I can only think of that as being the other issue, unless the carb itself got messed up. Which I can't see as being possible, given how easy fluid passed between all orifices. I never had to unplug any jets, so it can't be something internal.
Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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Re: 1981 CB750K - Repair/Tune-up

Half-Caf
Wasn't your kill switch, was it?
The best things in life are custom
Youtube: http://www.youtube.com/user/halfscb
1980 cb750f SS
Chicago, IL
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Re: 1981 CB750K - Repair/Tune-up

shinyribs
Administrator
Half-Caf wrote
Wasn't your kill switch, was it?
HAHAHA!  Hate when that happens! Especially when you're kicking it to start...good exercise,though.

Man Craig,I hate you keep running into problems.Good luck to ya buddy.
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Re: 1981 CB750K - Repair/Tune-up

cdaiscool
IT RUNS. But BOY is she rich.

Tuning comes tomorrow.


And no, it wasn't the kill switch. I pulled each wire from the carb, pushed it in some more, and tightened her back down. The 2nd or 3rd attempt, she fired up. I was able to give her some gas, and she would rev, but she would bog initially. So definitely a fueling issue at this point.

How many screws out do you guys have your pilot screws? The guide I followed suggested 3 full turns, so that's what I did. I'm betting that was too much.

Hell, she was running so rich, I smell like fuel from going 20 seconds behind my exhaust.


Turbos, Hondas, 4-bangers, what could go wrong?

Fuelly

Shiny: [...] Considering the weather you've had to put up with I'd say you get an Iron Butt award and a Frozen Nipple trophy to go along with it. First time I've ever posted the word nipple... it ends here.
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