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Old 07-15-2011, 09:30 PM   #1
finn747
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Default 82 Honda CM450 carb overflow

Hello,

I have an 82 Honda CM450 and it is leaking about 1 drop of gas every second out of the left float bowl overflow. I have taken the bowl off and everything looks good. The floats are clean move fine and are in good shape.

Anyone have any ideas on what the issue can be?

Thanks,

Sean
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Old 07-16-2011, 06:16 AM   #2
seruzawa
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The needle valve and seat have a piece of crud on them or are worn out.
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Old 07-16-2011, 09:12 AM   #3
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Ok thanks, I will take a look today or tomorrow.

Sean
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Old 07-16-2011, 10:06 AM   #4
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When he says worn out look for a ring around were it seals. If thats what you discover just replace it.
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Old 07-16-2011, 04:59 PM   #5
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So I swapped the floats and float valve from the right to the left, the right side is still fine and the left still leaks. I will try shooting some compressed air up there and hopefully that will do the trick.
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Old 07-17-2011, 06:37 AM   #6
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Quote:
Originally Posted by finn747 View Post
So I swapped the floats and float valve from the right to the left, the right side is still fine and the left still leaks.
Did you also move the SEAT that the needle valve goes into ??
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Old 07-17-2011, 09:34 PM   #7
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No, I think I will need to remove the carb to get to the seat. I am going to pick up some stuff tomorrow to clean the seat out real good the way it is and hopefully it will do something.
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Old 07-20-2011, 06:33 PM   #8
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I figured it out. The brass drain thing attached to the drain screw is leaking. Is it detachable or do I need a new float bowl?
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Old 07-20-2011, 06:51 PM   #9
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Quote:
Originally Posted by finn747 View Post
I figured it out. The brass drain thing attached to the drain screw is leaking. Is it detachable or do I need a new float bowl?
If you look up the picture on bikebandit.com it will show you.
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Old 07-21-2011, 06:28 AM   #10
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Quote:
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I figured it out. The brass drain thing attached to the drain screw is leaking. Is it detachable or do I need a new float bowl?
YOu may have overlooked one critical point.

That drain tube serves two functions. If you open the screw, it functions as a drain. With the screw closed, the pipe inside the bowl is still open at the top......and functions as an OVERFLOW.

All of your symptoms STILL point to the bowl being too full and a float or needle valve problem.

While it is possible that the drain tube is loose or cracked, it is HIGHLY unlikely.
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