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75 DT400B Carb Leaking

23 May 2020 22:05
dew05001
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75 DT400B Carb Leaking #1
Hi All,

I went to try and start up my bike today and when I turned the fuel petcock “on”, fuel started pouring out of the carb. I think I know the part that is missing, but I don’t know what it is called.

I’ve attached a photo from a carb I found on eBay. Can anyone let me know what this part is called and where I might find one?

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23 May 2020 22:33
MarkT
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75 DT400B Carb Leaking #2
That's a vent fitting, plastic, don't know where you could get one. It's not your problem though. Not even a chance it's your problem.

Try tapping on the float bowl a little... float could just be stuck open and often tapping a little will free it up.

Could be the float needle and seat are bad too... or some crud got stuck in the float valve.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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24 May 2020 09:16
dew05001
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75 DT400B Carb Leaking #3
Thanks so much for the suggestion. I’m going to take the carb apart and go thru it and give it a good cleaning.

That would make sense as to why I’ve been missing this piece for a while and this is the first time I’ve seen this problem.

Is it bad that I don’t have this vent fitting?

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24 May 2020 09:52
MarkT
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75 DT400B Carb Leaking #4
Might be a little more likely to suck dirt in the vent hole as the path is shorter...

You might be able to make something

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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24 May 2020 10:01
Lizeec
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75 DT400B Carb Leaking #5
Go to a decent auto parts store, they have a wide selection of plastic vacuum fittings, you can probably find a similar 90* nipple or possibly a straight nipple & glue it in there.
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24 May 2020 11:54
dew05001
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75 DT400B Carb Leaking #6
Good idea, thanks!

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24 May 2020 12:43
JayB
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75 DT400B Carb Leaking #7
Does anyone know if this will work for his application?


hvccycle.net/oil-injection-nozzle-360-14...-00-1a1-14000-99-00/

I need one to for a spare DT400C carb, too.

Thanks!

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24 May 2020 13:00
MarkT
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75 DT400B Carb Leaking #8
Right idea but oil injection nozzle is too small.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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