SOHC.co.uk Forums > CB500/550
CB550k1 US Import - UK registration
Laverdaroo:
Worth a shot Dave
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Oddjob:
Those are air vents to allow the float chamber to breathe etc. Also fitted so that if the bike falls on it's side, the petrol vents away from the engine and onto the floor instead of flowing all over the exhaust etc.
They'll make no difference at all to flooding carbs.
Have you changed either the needle float seat or the needle float valve itself? Aftermarket ones are known to cause problems with not seating correctly. Head shouldn't factor into it, my sons VT1100C uses a fuel pump and normal float valve seat and it stops that from pumping past the seat.
Set the float with the carb top removed and it resting on the top of the carb. That's best but if you don't want to remove the carbs you'll want the tang on the float JUST touching the pin on the float valve without starting to compress it.
McCabe-Thiele (Ted):
The pressure that a float can exert on a needle & seat is probably quite low in terms of shutting off the fuel supply. 34 ft of water is around 15 psi. Petrol is lighter than water so imho if you auxiliary tank is a foot above the filler tank you are doubling the normal pressure. 4 psi is typical of car systems using carbs & pumps.
juitz:
Put the aux tank at the same height as the normal tank, no leaks or overflowing so far! 😀
Laverdaroo:
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