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Re: Fuel Leakage

Posted by Hoosier Daddy on Jan 12, 2013; 9:18am
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Fuel-Leakage-tp4035156p4035188.html

The others are spot on but I am going to try and answer your question more direct.
 The carbs are vented (to the atmosphere). When the float bowls were empty the float dropped and the needle was raised off it's seat. Then it sat... assume that it stuck there. When you finally got fuel to flow, with the needles stuck open that allowed fuel to overflow the bowls and pour out the vents. That was you leak(s).
 Now you mentioned another symptom but didn't ask about it. What you called bleed screws are drains to empty the floatbowls. I think it started on '81's so I doubt if your bike has it, but see if your 1980 has an AFV. A vacuum operated fuel shut off.




It's a valve that if there is no vacuum from the engine running it closes to stop fuel flow. It has been the cause of so much grief it is nicknamed the "Spawn Of Satan" or S.O.S.

81 Honda CB750C - Current Project
67 BSA Spitfire MkIII - Next Up (Full Resto)
81 Honda GL1100 - Bob / Cafe´
80 Suzuki GS750L - Bratstyle
72 Honda CB450K5 - Basket Case
73 Honda CB350F Cafe' (Gone but not forgotten)

Don't wait for opportunity to knock... kick the door down and drag the old harlot in!