weber/dellorto floats

[120]

hey guys and gals, what use is the bottom setting on the floats?
If the top setting opens and closes the inlet valve, why is the full down setting important?
a standard setting figure is say 8 mm at light touch
and 15 mm at full hang
why is the hang number important?

Bruce

[papajam]

Since the needle is tapered, the more the valve opens the more fuel flow into the carb; up to a certain point. If the float level/drop (or hang) differential is only, say, 3-4mm, the carbs would very quickly run out of fuel at full throttle. Too much float drop could allow the needle to fall out of the valve resulting in....mmmmm a rich mixture of undesirable proportions.

[120]

thanks,
now that you mention it, what else holds the needle valve in.

who says there arn't stupid questions?

[papajam]

Well, since no one was born knowing everything, I say there's no stupid questions.
The needle is held in place by both the design of the seat and the float. I'll try to dig one out and post a pic.