What is this brass nub on my Mikuni BS38 carb?

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14 Jul 2011 02:14 #462771 by Tested
We are trying to figure out what the heck these brass tubes are on the side of the carb. Do they need to be plugged? Should a vacuum hose be on them?




2008 KLR 650

1977 KZ 750

_____ Have had _____

1981 KZ 440
1970's CR 125
1982 KLX 175

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14 Jul 2011 04:42 #462782 by bountyhunter
Replied by bountyhunter on topic What is this brass nub on my Mikuni BS38 carb?
I think that's the bowl vent line. The big brass on the side is fuel inlet, the small brass fittings on the bottom of the float bowls are overflow tubes.

Your bike will run without hoses on the vent nipples but the hoses keep junk from falling in and slow fuel evaporation.

1979 KZ-750 Twin

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