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Makotosun

1974 DT 125 carb overflowing

  • srsnow
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1974 DT 125 carb overflowing was created by srsnow

Starting to run out of ideas to fix the carb over flowing. Have cleaned the carb and the tank out a few times. Replaced the needle valve set. Tried with and with out filter.The float level seems to be hard to find a consistent height on, the service manual I have calls out 20mm +/- 2.5mm and one from the tech library lists 21mm +/- 1mm. I have also seen people say it should be 25mm. 20 to 22mm fuel over flows as soon as you turn the pet cock on 25mm and the bike won't start. Was going to try 23mm tomorrow but wondering if anyone has any insight that maybe I am missing
27 Jan 2023 19:55 #1

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Replied by AirborneSilva on topic 1974 DT 125 carb overflowing

I have to wonder if you're not taking your measurement from the wrong place on the carb body. If I remember correctly Mark T has suggested that if you get the floats parallel that should be close, of course Mark can correct me if I've misquoted him.
2023 Tenere T7
1976 DT400C
1975 DT400
1981 DT175H
1972 DT2 250
1980 GT80
1972 JT2
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Last edit: 28 Jan 2023 03:38 by AirborneSilva.
28 Jan 2023 03:16 #2

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Replied by MarkT on topic 1974 DT 125 carb overflowing

Yes, float arms parallel to float bowl gasket surface.
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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28 Jan 2023 03:36 #3

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Replied by Tom P on topic 1974 DT 125 carb overflowing

Could also be a leaky float, if you have the old brass float. Take it out and shake it, and see if you hear anything inside.
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28 Jan 2023 07:34 #4

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Replied by msavitt on topic 1974 DT 125 carb overflowing

set it parallel to gasket surface, put bowl back on, then see if you can blow thru inlet with carb upside down to save yourself time of putting back on, taking back off
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28 Jan 2023 08:23 #5

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Replied by srsnow on topic 1974 DT 125 carb overflowing

It isn't brass, it looks to be a type of black plastic for the float and brass for the frame, not sure if it was replaced at some point, the current replacements look to be completely white plastic
28 Jan 2023 09:18 #6

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Replied by srsnow on topic 1974 DT 125 carb overflowing

So doing this works but after the carb has sat for a few mins you can blow through it again tap the float bowel and the float will drop down and seal up. It seems the float is getting stuck with or with out gas in it when the bowel is installed. Everything seems to move freely and it is a new needle and seat, any ideas?
Last edit: 28 Jan 2023 10:15 by srsnow.
28 Jan 2023 09:53 #7

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Replied by Tom P on topic 1974 DT 125 carb overflowing

28 Jan 2023 11:37 #8

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Replied by srsnow on topic 1974 DT 125 carb overflowing

It does look exactly like that one
28 Jan 2023 12:26 #9

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Replied by CrazyTrain on topic 1974 DT 125 carb overflowing

If you still have troubles after replacing things I have a carb I'd sell you. Off same model, shes not the prettiest but ran good on my bike!
31 Jan 2023 21:42 #10

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