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I'm not sure where its leaking from because I can only see it at the bottom of the float bowl and it's only happening when it's running on the bike
Would these O rings only leak when the engine's running because I could Turn the ignition on The fuel pump will run and pressurize the carbs but no leak but it will leak when the engine is running. I had the carbs rebuilt last year they never detached the carburetors to replace the old rings but I'm pretty sure they replaced the other rings this kind of makes sense to me.2005 Yamaha FZ1 (FZS1T) Carburetor | Part Shark
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O-Ring Item 58 was what was leaking on my carbs a couple years ago. Looked like it was a carb bowl leak till I looked closer to see it was coming from higher up.
Those are on the fuel rail, Item 57 between carbs. If that's what it is, it requires de-racking the carbs. Don't panic, it's doable. If you find that's what it is report back and I''ll walk you thru it.
Personally, I won't clean 24 y.o. carbs without a complete de-rack and replacement of every o-ring. Getting the balance springs back in is a pain, but not hard when you know some tricks. There was a great FZ1OA thread on this with all the OEM and McMaster-Carr o-ring cross reference numbers.
My biggest regret when the site went down was not having those mccmaster carr p/n's. I realize you have to buy a huge bag of them, but i wanted some for that fatefull day.
Its leaking from the carb