I need help QUICK. I'm synching my carbs

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I need help QUICK. I'm synching my carbs

Muscle racer
I finally got everything together to synch my carbs. I looked online and built my own manometer. It's all working properly. I know carb #2 is the control and you adjust the other ones to match #2. when I turn the bike on, #2 has too much vacuum and sucks up all the liquid in the manometer. So do I tighten the adjust screw or loosen it to match #2?

Please help bc I'm in my garage doing it right now.

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Re: I need help QUICK. I'm synching my carbs

TOOLS1
Administrator
I do not know right off the top of my head, but, you have a 50/50 chance of getting it right the first time.
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: I need help QUICK. I'm synching my carbs

kramit
In reply to this post by Muscle racer
This may be a little to late, and you may have synced your carbs already. I have a carbtune for
syncing carbs. I do not know how your homemade unit is made, but I have used Carbtune, and
manometer that uses mercury to adjust carbs both of these units use restricters to hold down vacum while adjusting carbs, without these the vacum will flucuate widley. If you go to their web site you can find the manual so you can see the restricters which is a small peice of tubing that looks solid but has very small hole that is placed in the tubing about 6" from the manometer its self furthest from the carb. The home
made unit probably has no restricters or dampening device. As far as adjusting I loosen the 1,3,4 carb
but not to loose. and start on carb 1 just turn in very small movement to see if liquid is going in the right
direction to match the no 2"s heigth  in liquid. If I am correct turning screw clockwise to make liquid rise and counter clockwise to lower liquid. Do each carb, and come back if needed to readjust. Object is to get the carbs with all the carbs pulsating to the same height. If everything looks good tighten nut slowly and make sure the adjustment does not change the settings.You may have known all this but I was not sure if you got a answer yet.!!!! The carbtune is not cheap but it uses small metal rods instead of liquids.

Kramit
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Re: I need help QUICK. I'm synching my carbs

LukeM
Administrator
+1 for carb sync making a difference.  I found my Avenger II was WAY out of sync on Sunday, so I got it all tweaked out.  Starts easier, smoother operation, shifts nicer, a bit quieter (not as much clatter), and I hope to see the mileage pick up a bit as well.  My bike is a Honda Shadow, so sync'ing 2 carbs is a lot easier than 4.  But I lose the "cool" ness of the inline 4.

Here's the trick for the Honda 4s:
work on cylinders 3 and 4, and get them to line up.
work on cylinders 1 and 2, and get them to line up.
THEN, balance between 3&4 and 1&2.

I did verify this with an older Honda mechanic.
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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Re: I need help QUICK. I'm synching my carbs

TOOLS1
Administrator
That is how, you do a Kawasaki. The throttle on them is split between 1-2, and 3-4. On the Honda's if, you have keyhole carbs. They all sync to No#2 which is not adjustable. On the round tops, you just set them to any one carb, then adjust the idle.
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: I need help QUICK. I'm synching my carbs

shinyribs
Administrator
HAHA  sorry to change the subject,but i just now noticed your signature,Luke


Ok,continue....