My CB750F Supersport 1982 wont pass 6500rpm.

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Re: My CB750F Supersport 1982 wont pass 6500rpm.

TOOLS1
Administrator
You might have some luck opening the fuel screws, but........
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: My CB750F Supersport 1982 wont pass 6500rpm.

gkmaia
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Re: My CB750F Supersport 1982 wont pass 6500rpm.

gkmaia
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Re: My CB750F Supersport 1982 wont pass 6500rpm.

shinyribs
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What jets/needles/positions/adjustments did you end up with that are working for you?
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Re: My CB750F Supersport 1982 wont pass 6500rpm.

gkmaia
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Re: My CB750F Supersport 1982 wont pass 6500rpm.

shinyribs
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Awesome. Thanks for that info bud.

Your symptoms sound identical to mine.

The weird metallic noise you mention, does it sorta sound like valve rattle or pre-ignition to you? Mine makes a similar sound and I'm wondering if it isn't just the sound of the piston in the carb rattling.
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Re: My CB750F Supersport 1982 wont pass 6500rpm.

gkmaia
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Re: My CB750F Supersport 1982 wont pass 6500rpm.

gkmaia
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Re: My CB750F Supersport 1982 wont pass 6500rpm.

munster
In reply to this post by TOOLS1
Hi Tools...you mentioned the venturi effect, is there a right way to have the rubber boots in the air box, I noticed one side has a flat on the rubber?
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Re: My CB750F Supersport 1982 wont pass 6500rpm.

TOOLS1
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That little flat spot is to index the boots to the proper position. There should be a high spot on the airbox that they go to.
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: My CB750F Supersport 1982 wont pass 6500rpm.

munster
In reply to this post by munster
Many thanks for that, the manual doesn't show the airbox too well
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