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My 1973 DT3

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Replied by Swoop56 on topic My 1973 DT3

Yamaha call it a Valve seat Assy . Your fishe there showed the 360 option also which has
a bigger apperture . Strangely they described the 360 item as a needle valve set .
Both descriptions are accurate , but your 250 uses the 2.0 sized valve , and the 360
uses the 3.3 size valve . Hope that clears things up for you .
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18 Jun 2021 22:41 #21

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Replied by MarkT on topic My 1973 DT3

Yes, the shared parts lists can be very confusing.  First one with 168 prefix is the 250 part.

Not sure if you need the washer or not.  Sometimes it comes with the needle valve or if aluminum can often be reused.

Float arms parallel to float bowl gasket surface with valve closed (like yours was) is generally a good float height setting.
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
19 Jun 2021 07:29 #22

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Replied by bhepp15 on topic My 1973 DT3

Sanded off the black paint PO had put on the Gauges. They are looking good but I want to get them all shined up as I believe that’s how they came. I also noticed my tach silver clamp ring is broken and I will need to redo the plate on the tach as well. 
Last edit: 29 Jun 2021 21:11 by bhepp15.
29 Jun 2021 20:21 #23

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Replied by Gr8uncleal on topic My 1973 DT3

That is not a tacho off a RT3 - the only light it has is an indicator warning light.

As it has a red charge warning light, the one in your photos is more likely from one of the AT models, or maybe a CS5 or RD200.
29 Jun 2021 23:53 #24

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Replied by bhepp15 on topic My 1973 DT3

I was wondering if that was the case because there were 4 light holes but only two lights on the bike! I thought I just be missing something since I haven’t got the electrical working yet but that makes a lot of sense. Atleast it works!
30 Jun 2021 04:54 #25

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Replied by Gr8uncleal on topic My 1973 DT3

Yep, been there myself!

I'm in the UK and my US import RT2 had a tacho with a neutral light and it took me a while to suss out that it had a CT2/3 item fitted! 

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At least you won't have to start a thread asking where the neutral light switch is! 

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Of course, once you have identified exactly which model your tacho is off, you should be able to sell it on and cover some or all of the cost of a correct one. 

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30 Jun 2021 05:02 #26

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Replied by bhepp15 on topic My 1973 DT3

Good point 

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 I’ll have to see if I can figure out what it came off of. 

Soo I guess does Anybody have a dt3 tach for sale? Haha
Last edit: 30 Jun 2021 05:36 by bhepp15.
30 Jun 2021 05:31 #27

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Replied by Gr8uncleal on topic My 1973 DT3

I guess that I should ask this seller for commission! 

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This is the correct part. As I said in one of Jack's threads, this seller conflates some of his parts descriptions!

1973 Yamaha DT250 Enduro Tachometer W Wires DT dt 250 | eBay
Last edit: 30 Jun 2021 06:47 by Gr8uncleal.
30 Jun 2021 06:46 #28

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Replied by bhepp15 on topic My 1973 DT3

After a month of troubleshooting, I finally got it to run and drive! The only trouble now is that the spark plugs are fouling every day and there is black liquid (I'm assuming unburnt fuel) coming out of the exhaust where it attaches to the engine (probably because I'm still waiting for my exhausted gasket to come). Im wondering if I just need to lean our my field mixture, if my coil is bad, timing bad, I'm not really sure. It has also been in the 40's the last week here so fairly cold. Just don't want to keep buying plugs.
06 Nov 2021 15:35 #29

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Replied by adguy2112 on topic My 1973 DT3

Any White smoke coming out of the tail pipe? While it’s running take out the lower end dipstick and see if you have exhaust pressure coming out the dipstick hole. I’ll let the experts confirm a diagnosis. Just spitballing on the possibility it’s a bad crank seal. Could be other things. 
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06 Nov 2021 17:12 #30

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