gas dumping out of somehwere

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gas dumping out of somehwere

nilsthenomad
So I just sent my carburetors out to a shop for a full cleaning and rebuild and got them back today. Installed em and started up the bike in hopes of going for a ride. After about 30 seconds of warming up and throttle, a pool of gas started dumping just under the clutch casing. The carbs are good and dry and my fuel line in connected tightly. So it has to be from somewhere down low and only when the bike is running. I have to assume this has happened to someone before and would love the help right now.
'81 CB750K, '70 C70. As long as the Honda's older than I am, I'm happy...
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Re: gas dumping out of somehwere

TOOLS1
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Sounds like a float needle is stuck. Try tapping on the carbs with the handle of a screwdriver, sometimes that will make them seal.
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: gas dumping out of somehwere

nilsthenomad
the gas isn't coming out of any of the carb overflows, it literally is coming out quite low either onto or right next to the exhaust below the clutch casing. I've felt around the carbs and cylinders and cannot feel any gas above the clutch casing.
'81 CB750K, '70 C70. As long as the Honda's older than I am, I'm happy...
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Re: gas dumping out of somehwere

TOOLS1
Administrator
Is it coming out of one of the little rubber tubes that are attached to the float bowels? That's where they are routed.
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: gas dumping out of somehwere

nilsthenomad
unfortunately my bike hasnt had those hoses for some years now, so when they overflow I can see it drip right from the bowl
'81 CB750K, '70 C70. As long as the Honda's older than I am, I'm happy...
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Re: gas dumping out of somehwere

Re-run
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In reply to this post by nilsthenomad
Fuel can only come from so many places. Either the carbs or the tank. Double check that a pin hole didn't develop in the tank.

After that, it has to be the carbs. It might not be from the overflow but the fuel tubes between each carb. One of them might have a bad oring or it didn't seal right. That is about the only other possibility.
The ride IS the adventure. The destination is just to get gas!
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Re: gas dumping out of somehwere

TOOLS1
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Or the vent tubes.
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: gas dumping out of somehwere

nilsthenomad
Well it appears that it is oil spraying out of where the clutch arm meets the clutch cover. When it first came out it smelled and felt more like gas (which now has me concerned that there is gas in my oil), but appears to actually be oil out of the clutch cover. Is there a gasket where the clutch arm meet the cover than could be the problem?
'81 CB750K, '70 C70. As long as the Honda's older than I am, I'm happy...
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Re: gas dumping out of somehwere

LukeM
Administrator
There should be some sort of gasket or O ring to keep the oil in.  Look at the FSM or the online microfiches at bikebandit.com and look at the parts breakdown.  I'm willing to bet there's something there.

Good luck.
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: gas dumping out of somehwere

nilsthenomad
Thanks for the advice all.

So here's what i think happened: Before I had sent my carbs out for tuning and cleaning my bike sat for about two months with a leaking petcock (my SOS was removed some time ago because it leaked) that I didn't know about. From what I can tell gas basically filled the carbs and continued on to the cylinders and into the oil. After I attempted to start it up the other day and i had leaking gas/oil immediately, I decided to drain the oil and ended up having almost 6 quarts of gas/oil drain out. I have to assume the overload of the mixture in the clutch and the thinness of it is what caused it to spray out of the clutch casing.

I've since been able to replace my petcock and find a new SOS from a local junkyard and now she's purring like a kitten and driving beautifully and leak free. I let everything drain for an afternoon and changed my oil filter in hopes of making sure the gas/oil mixture is all out.

Like i said this is only what i assume happened. Can anyone verify it? I plan on checking my oil again in a few days to make sure that the problem doesn't persist and indicate a greater problem.
'81 CB750K, '70 C70. As long as the Honda's older than I am, I'm happy...