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Would like jet size

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Lucky 1
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Would like jet size

Lucky 1
I know this question must have been answered many times because
my CB750 is 33 years old now.

I am building a cafe style bike and I would like to know the main jet size with
Kerker exhaust and aftermarket free flow air filters.

Must have been done MANY times now.

Thanks in advance. i appreciate your knowledge.
On a Roadstar Adventure.
Re-run
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Re: Would like jet size

Re-run
Administrator
A 33 year old so you have a 77 or 78 but is it a K or F? Or the elusive A?
The F had a 105 main and the K had a 110 main.
By after market free flow filters, I assume you mean pods right?
Let us know the year and model of bike and the brand of pods and we might give you a starting point.
Keep in mind that every engine is different and so we can only give a start point.
The ride IS the adventure. The destination is just to get gas!
Lucky 1
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Re: Would like jet size

Lucky 1
Oh ,sorry about the lack of info.

It is a 1978 K model.
It will have those cone shaped pods for air filters.
and four into 2 into 1 exhaust Kerker cafe style.
The exhaust has some removable mufflers inside it.
I will probably keep the mufflers.

i got the exhaust from cycle exchange.
The mains in it now are 110's.

The exhausts are from cycleX (exchange)
On a Roadstar Adventure.
TOOLS1
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Re: Would like jet size

TOOLS1
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In reply to this post by Lucky 1
I myself would rather have a severe beating, then to re-jet keyhole carbs However, rather then blue your new pipes, by being too lean. I would raise the needle one notch, and use a 120 to start.
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)
Lucky 1
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Re: Would like jet size

Lucky 1
What do you mean "keyhole" carbs?
The exhausts are BLACK no worries about pipes blueing.

I have the carbs off now. They are easy to change the main jet.

On these CR type carbs i do not see the idle jet.
Is it hidden?

On a Roadstar Adventure.
TOOLS1
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Re: Would like jet size

TOOLS1
Administrator
The 77-78 carbs are referred to as "key hole," because of the shape of the top cover.
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)
Lucky 1
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Re: Would like jet size

Lucky 1
What is hard about rejetting the carbS?

The Honda VF v4 engine series is the absolute worst carbs I have ever worked on.
On a Roadstar Adventure.
TOOLS1
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Re: Would like jet size

TOOLS1
Administrator
donald branscom wrote
What is hard about rejetting the carbS?
What is easy about it? I will admit the old round tops are easier then the Key hole carbs (you do not need to remove, and disassemble them to change the needle settings).
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)
Lucky 1
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Re: Would like jet size

Lucky 1
I agree that the "old" (good) style were better because You could just unclip the float bowl
and take a jet out easily.

After that all the float bowls had screws and made removal of the entire carb set mandatory!

The float bowls held on with clips never failed.
Someone probably did not put the clip on correctly and sued HONDA.

Many "improvements" on cars and motorcycles were initiated with a lawsuit.
Some were good changes and some were a pain in the rear.

 

On a Roadstar Adventure.
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