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My 1973 DT3

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Replied by bhepp15 on topic My 1973 DT3

Update: I figured what one of my problems are atleast I think. I’m pretty sure the floats are stuck, it seems to have all the symptoms of that. So I am going to get the worked out as well asa new seal where the carb mounts to the engine as I think as those get old they can start to leak air. Going to service petcock to bc it leaks. I also need a new air filter but all I can find so far is a $30 that comes with the mesh cage that I don’t need. 
15 Jun 2021 08:54 #11

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Replied by Swoop56 on topic My 1973 DT3

I think you'll find the genuine Yamaha filter is still available . Probably more expensive than $ 30 ,
but many people have found the Unifilter overly restrictive , so I'd go OEM , even if you have to pay more .
15 Jun 2021 17:34 #12

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Replied by bhepp15 on topic My 1973 DT3

Okay, I found the OEM one today and will order that but it is only $14.99 on Yamahapartshouse that is the element air cleaner .  On the note of OEM I am buying a new intake manifold and am wondering if I should buy that OEM/NOS or an aftermarket one.  I can't find too many of them that arent NOS so I may have to go that route anyway.
Last edit: 15 Jun 2021 18:39 by bhepp15.
15 Jun 2021 18:36 #13

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Replied by bhepp15 on topic My 1973 DT3

My carb was leaking gas out of the bottom and the bike was not starting so I figured the float was stuck. I took the carb of now and I tested the floats and they float like a boat and everything else looks good, I am going to change the O-ring on main jet though.  The needle valve also appears to be in good working order. Is the float arm supposed to look like this when holding it upright?   
18 Jun 2021 15:39 #14

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Replied by darinm on topic My 1973 DT3

I can't remember how it looks off the top of my head, but I do know it's possible to install that float arm upside down and the bike runs much like what you are saying. Don't ask how I know....
1972 Yamaha CT2 175
1972 Suzuki TS185 Sierra
1986 Yamaha IT200
2013 Yamaha XT250
18 Jun 2021 16:21 #15

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Replied by bhepp15 on topic My 1973 DT3

haha I know the first time I tore into the carb I briefly had it upside down but I am pretty sure this is the right way or else I think the needle valve would be able to fall out.  I am wondering if maybe the tab that stops the arm is bent and it is allowing gas to continuously enter.
18 Jun 2021 17:30 #16

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Replied by Swoop56 on topic My 1973 DT3

Take another photo with the float arm pointing upward . Then we can get a look
at your float level adjustment .
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18 Jun 2021 17:35 #17

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Replied by bhepp15 on topic My 1973 DT3

Heres a few orientations 
18 Jun 2021 17:54 #18

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Replied by Swoop56 on topic My 1973 DT3

That setting shouldn't be dumping fuel out the overflow pipe .
Either the needle and seat is worn or there is dirt or something preventing it
shutting off the fuel . I'd just replace it myself .
18 Jun 2021 22:00 #19

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Replied by bhepp15 on topic My 1973 DT3

I am planning on replacing it. Just wanted to make sure that I wasn't missing anything obvious as I am pretty new to this.  Is it the valve seat assembly or the needle valve set? 
18 Jun 2021 22:10 #20

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