CBR 600F2 1991 - 1994 CBR 600F2

Carb leak

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Old 03-11-2012, 06:16 PM
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Default Carb leak

Got my bike out of storage today. Went to start it up and I noticed there was gas leaking from the carbs took the tank off and pulled the carbs removed the float bowls gaskets are still good replaced them last year. I reassembled it started her up and got the leak still. It seams to be a pretty decent leak not just a small leak. So I'm almost 100 percent sure it isnt coming from the float bowls so pretty much im puzzled on where its coming from.
Here's a pic of where the gas is coming from

My question is where is it coming from? any prone or possible pieces in the circled area?
 
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Old 03-11-2012, 08:05 PM
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How likely is it to be the gasket on the joint where the fuel hose attaches to? The joint itself looks fine.
16040-MZ1-790
 
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Old 03-12-2012, 06:21 AM
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Check the seals, but start with the float needles. I am 90% sure if it isn't a small leak, it is the float needles. Replace all 4 all at the same time, they are are a easy fix. Find the carb cleaning thread and you will smack yourself how easy it is to replace them.
 
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Old 03-12-2012, 11:27 AM
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what is between the carb towers and the carbs itself, the screw on plastic plates? both my carb sets didn't have those... Im missing things!!!!
 
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Old 03-12-2012, 06:44 PM
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Originally Posted by underground-mpyre
Check the seals, but start with the float needles. I am 90% sure if it isn't a small leak, it is the float needles. Replace all 4 all at the same time, they are are a easy fix. Find the carb cleaning thread and you will smack yourself how easy it is to replace them.
I hope it's that easy. If the needles are bad they can cause a leak? Where would the gas be seeping out of? I pulled the bowls apart over the weekend and seals are still in good shape
 
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Old 03-12-2012, 07:17 PM
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The needles are aluminum and mine were corroded. The get a tiny bit of corrosion and they will stick. You can try sanding the edges of the needles, but better to replace them. There is a spring at the end of them and do get worn out. Try this, if your floats are just resting on the top of the float bowls, good time to change them, they should be springy. I changed mine, got better mileage and better tone out of replacing the float needles. I am sure if your gaskets looked fine, I bet there is a tiny bit of corrosion on that bank of the float needles and causing them to stick. They stick and fuel goes backwards.
 
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Old 03-13-2012, 06:57 PM
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Well I pulled the float bowls apart again today. I took a closer look at the needles and they seem to be clean with no corrosion.
The floats seem to be good yet, they definitely have spring left to them. Push them down they pop right up. So I guess I'm still stuck with the same question. What ELSE could potentiality be causing this?
 
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Old 03-24-2012, 08:47 PM
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Well I ordered the joint gaskets last week I received them yesterday and replaced them today. Put it all back together and NO MORE LEAK!
 
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Old 04-04-2012, 08:36 PM
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I replaced the o-rings on both of the t-joints on the fuel supply. I noticed after I got the new ones on that the joint was a lot stiffer. my old gaskets were definitely shot, they were completely flat.
 
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