Carb is draining, Float is down???

Technical Help Forum

Carb is draining, Float is down???

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Tstewart IL 07-20-2008, 2:35 PM
I've been reading some older posts about carbs dumping fuel, and thought my issue was the float staying up. I've seafoamed, tapped, and removed the carbs. THe floats are falling as they should.

What elso could possibly make these dump gas like this? Should the drain valve be closed on the bottom of the Carb?

Thanks for the help, Taylor
p.s. Love the forum

Re: Carb is draining, Float is down???

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Blindstitch2002 07-20-2008, 3:14 PM
Fuel valve not seating properly. Possibly gummed up, misshapen or just not working.
Slits in the overflow stems inside the carb. You can test this by filling them up with water over a sink and if when they are full they start to leak. Look for a small crack down the stem, sand it and solder it back togeather.

If you mean the drain valve at the bottom of the carb that has a small screw in it facing to the left. Yes it should be tight. If it isn't tight then fuel will drain out of the carbs.

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1978 Honda Cx500 Maggot
1979 Honda Cx500 Custom
1980 Honda Cx500 Deluxe Couch Project Bike

CX500 Factory Service Manual
Courtesy of Randall-in-Mpls

Re: Carb is draining, Float is down???

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Pooterhead 07-20-2008, 3:15 PM
Yes. Drain valve should be closed.

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1980 cx500c (fubar) you meet the fastest people on a honda!

Re: Carb is draining, Float is down???

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NstyDevil 07-21-2008, 5:07 AM
and occasionally, just occasionally mind you, as the parts go back in, and the carbs go back on, and if the drain is still closed, I give the carbs a rap with the plastic end of the screwdriver, to "help" get the floats back in their movement range.

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'80 CX500 Deluxe
approx 80k on the odometer