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Old 07-08-2014, 04:11 PM   #1
akpasta OP
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Honda CB500T - Float Valve Leak

Hello,

I'm working on a 1976 CB500T. I pulled the carbs apart and replaced the floats and all rubber parts like o-rings, diaphragm, etc. Put em all back together and added fuel and noticed the left carb leaks fuel (it previously did not). I removed the float-bowl, pushed the float up to where the valve should be closed and it still leaked. So I took the float off, and using my finger, closed the valve. Fuel flows through the float valve when when it is manually closed by hand. To check the seal of the valve threads, I also tried removing the valve, plugging the hole with my finger and turning the petock on. It seals fine there. So it seems the valve is not seating well anymore. What could be causing this? Could it be that I mixed up the float valve pieces on each side? Is there an O-ring component I'm missing (I don't think there is...). For what It's worth, I messed around with it a bit, re-installed, and it seemed to stop leaking so perhaps things just needed to re-seat or maybe my float level was just somehow off in a weird way? I'm not sure. Any advice would be great.

Thank you!
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Old 07-08-2014, 07:11 PM   #2
LonerDave
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New float needles, too?
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Old 07-08-2014, 09:00 PM   #3
asim595
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It is great loss for the company.
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Old 07-08-2014, 10:58 PM   #4
akpasta OP
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Quote:
Originally Posted by LonerDave View Post
New float needles, too?


Actually no. I think my problem is the "genuine honda" cb500t rebuild set I bought was BS. The new valve didn't screw in and is wrong and the new needle doesn't really seem to seal the old one. And the old needle doesn't seen to fit the old valve anymore. Ordering repro stuff can be a pita.
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Old 07-11-2014, 09:11 AM   #5
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Well, that there seems to be the problem.

Repro parts? Can you get carb rebuild parts from Mother Honda? Sometimes worth the extra money to go with OEM.
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Old 07-11-2014, 10:04 AM   #6
akpasta OP
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Originally Posted by LonerDave View Post
Well, that there seems to be the problem.

Repro parts? Can you get carb rebuild parts from Mother Honda? Sometimes worth the extra money to go with OEM.
They supposedly were OEM, but perhaps mislabeled or something, or maybe different production year 500Ts had slightly different carbs. I dunno.
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Old 07-12-2014, 11:12 AM   #7
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Get a magnifying glass and a light and look at the seat, could be some schmooze giving you a poor seal.
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