Fuel leaking into front Cyinder.
01-05-2012, 05:17 PM
#1
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Location: Edwards AFB, CA
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Fuel leaking into front Cyinder.
A few months ago I used the Carb Set-Up and did the whole shibang. Ran fine for the first week but after sitting over night it would get to TDC on one of the cylinders and I would have to wait about a min for the pressure to leak out, then it would start. So after my rear CCT went out I tore the bike apart and found that I had fuel in my front headder pipe and about 1 qt in the oil sump. I rebult the carbs and checked my floats and valves and all checked out.
I am not too familiar with carbs so I wasnt sure if the needle shim stack was too thick if it would let fuel out of the front carb and leak into the front cyl, OR if it the job of the the float and valve in the bowl of the carb that allows fuel out of the bowl. Both floats are dry inside and dunked them in a 10gal bucket to look for air bubbles and nothing... I feel like Im over thinking this. Any help would be great.
Thanks, Squid.
I am not too familiar with carbs so I wasnt sure if the needle shim stack was too thick if it would let fuel out of the front carb and leak into the front cyl, OR if it the job of the the float and valve in the bowl of the carb that allows fuel out of the bowl. Both floats are dry inside and dunked them in a 10gal bucket to look for air bubbles and nothing... I feel like Im over thinking this. Any help would be great.
Thanks, Squid.
01-05-2012, 06:32 PM
#3
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Location: Lake View Terrace, CA
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Step one would be replace the float valve:
Honda, ATV Parts, Scooter Parts, Motorcycle Parts,CRF,CR,MX Parts, Goldwing parts
Pos #23
These should be replaced every couple of yeas anyways and it doesn't matter how it looks, it is not functioning properly.
This causes the bowl to overfill and drain into the cylinder.
Also make sure you clean the seat before you install the new (I would replace both) parts.
Next, rebuild your petcock. It is also leaking. One float bowl and the fuel line to it does not have enough fuel in it to completely fill a cylinder like you describe.
Honda, ATV Parts, Scooter Parts, Motorcycle Parts,CRF,CR,MX Parts, Goldwing parts
Pos #23
These should be replaced every couple of yeas anyways and it doesn't matter how it looks, it is not functioning properly.
This causes the bowl to overfill and drain into the cylinder.
Also make sure you clean the seat before you install the new (I would replace both) parts.
Next, rebuild your petcock. It is also leaking. One float bowl and the fuel line to it does not have enough fuel in it to completely fill a cylinder like you describe.
01-05-2012, 07:07 PM
#4
Wild Man
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Join Date: Oct 2011
Location: California Central Coast
Posts: 189
Step one would be replace the float valve:
Honda, ATV Parts, Scooter Parts, Motorcycle Parts,CRF,CR,MX Parts, Goldwing parts
Pos #23
Honda, ATV Parts, Scooter Parts, Motorcycle Parts,CRF,CR,MX Parts, Goldwing parts
Pos #23
time to pull those carbs and clean them while you're at it.
01-05-2012, 07:55 PM
#5
Senior Member
Superstock
Thread Starter
Join Date: Apr 2011
Location: Edwards AFB, CA
Posts: 491
Step one would be replace the float valve:
Honda, ATV Parts, Scooter Parts, Motorcycle Parts,CRF,CR,MX Parts, Goldwing parts
Pos #23
These should be replaced every couple of yeas anyways and it doesn't matter how it looks, it is not functioning properly.
This causes the bowl to overfill and drain into the cylinder.
Also make sure you clean the seat before you install the new (I would replace both) parts.
Next, rebuild your petcock. It is also leaking. One float bowl and the fuel line to it does not have enough fuel in it to completely fill a cylinder like you describe.
Honda, ATV Parts, Scooter Parts, Motorcycle Parts,CRF,CR,MX Parts, Goldwing parts
Pos #23
These should be replaced every couple of yeas anyways and it doesn't matter how it looks, it is not functioning properly.
This causes the bowl to overfill and drain into the cylinder.
Also make sure you clean the seat before you install the new (I would replace both) parts.
Next, rebuild your petcock. It is also leaking. One float bowl and the fuel line to it does not have enough fuel in it to completely fill a cylinder like you describe.
01-05-2012, 09:31 PM
#6
Banned
MotoGP
Join Date: Aug 2007
Location: Lake View Terrace, CA
Posts: 5,942
Hold them under water, no bubbles, good to go....
Though it never hurts to replace them.
01-06-2012, 02:56 AM
#7
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Join Date: Apr 2011
Location: Edwards AFB, CA
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My thought was since it is such a pain in the a$$ to get to the carbs that I might as well replace them now. Maybe I can make it another 4000 miles before I have to dig into them again. Who knows.
01-06-2012, 04:53 AM
#8
My brother has the samo problem on his GS1100.
The floats do not stop the fuel and he ends up(three times by now) with engine full of fuel and oil.
He did replaced the valves but still got the same problem.
The floats do not stop the fuel and he ends up(three times by now) with engine full of fuel and oil.
He did replaced the valves but still got the same problem.
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