carb overflow mystery

[Freebeer]

Did you ever figure out the culprit? A bad valve and valve seat perhaps? I'm having the same issue, just rebuilt all carbs with new o-rings, valves and seats seamed fine. I set the float height properly, but it still is leaking.

I have a hope that it is the tank vent. I'll be checking that tonight.

[wompin]

Did you ever figure out the culprit? A bad valve and valve seat perhaps? I'm having the same issue, just rebuilt all carbs with new o-rings, valves and seats seamed fine. I set the float height properly, but it still is leaking.

I have a hope that it is the tank vent. I'll be checking that tonight.

I had my carbs off just the other day for probably the fourth time. I set them up with a temp fuel tank. They held back fuel but the level in the clear fuel line would drop about 1" per hour. There was no accumulation of fuel on the floor like there was during earlier trials, though. I cleaned and polished the needles and seats, but got same result. I have concluded that the 1"/hr drop must have been due to evaporation of fuel.

I did buy new needle/seat valves all around just to be sure. No leaks. Im pretty sure the issue all along has been bits of rust and/or debris getting in between the needle and seat. Most likely my other needles/seats are fine. They show no signs of wear, anyways.

[Guest]

Have you check for a gas smell in your oil yet?

[BassCliff]

Hi,

I found this on some guy's website:

Overflowing Carbs


Thank you for your indulgence,

BassCliff