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Makotosun

1975 DT250 coming back home soon....

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Replied by darinm on topic 1975 DT250 coming back home soon....

She looks great. As a common theme you'll see here, if you get a carb kit just ignore the jets and use the original ones. It may just need a good cleaning and bowl gasket though. Well infamous little rubber o ring too.

Lights, if the battery was dead it may have just blown all the bulbs. Hopefully it'll be as simple as a fresh battery and new bulbs.
1972 Yamaha CT2 175
1972 Suzuki TS185 Sierra
1997 BMW R1200R
2009 BMW X-Country 650
2013 Yamaha XT250
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02 Apr 2019 08:33 #11

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Replied by Gr8uncleal on topic 1975 DT250 coming back home soon....

+1 on the carb kit.

Re the lights, another regular piece of advice on the pre '76 models is to fit a voltage regulator. The original Yamaha service guide instruction is in the Tech Library on this forum. If the lights have blown twice then you'll probably need one.
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02 Apr 2019 08:58 #12

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  • Rimneck
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Replied by Rimneck on topic 1975 DT250 coming back home soon....

I know for sure the headlight bulb is blown. It's black and milky - but haven't looked at the other bulbs. I did find the TSB about adding the voltage regulator on the older DT's. The carburetor was "rebuilt" a few years ago supposedly. How can I tell if it still has the original jets? And what is the o-ring you speak of?
02 Apr 2019 10:49 #13

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Replied by Makotosun on topic 1975 DT250 coming back home soon....

click up on the top menu and go to the tech section of the site. We have a factory service manual which will cover that bike so you can verify jet sizes, etc.

Great looking project and even better story behind it!

Mako
IF it isn't one thing, it's another.
02 Apr 2019 11:44 #14

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Replied by MarkT on topic 1975 DT250 coming back home soon....

Also, original Yamaha-Mikuni jets and needles have a "square within a square" mark stamped in them.

Here's a website that explains better than I can: www.nichecycle.com/ncs/blog/genuine-miku...and-how-to-tell.html
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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02 Apr 2019 15:29 #15

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Replied by yamahahaha on topic 1975 DT250 coming back home soon....

Niche Cycle Supply is about 40 minutes south of me. I've bought from them before. Good people to deal with :likey

They sell a DT250 carb kit at a really good price. here is a link on their site and they sell on Ebay

www.nichecycle.com/ncs/categories/carbur...uild-kit-by-ncs.html
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Last edit: 03 Apr 2019 09:46 by yamahahaha.
02 Apr 2019 16:21 #16

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  • Rimneck
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Replied by Rimneck on topic 1975 DT250 coming back home soon....

I’ve got this ordered. I’ll use the gasket and other stuff but just clean and reuse the original Mikuni jets etc. (Hopefully they’re still in there).
03 Apr 2019 17:31 #17

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Replied by MarkT on topic 1975 DT250 coming back home soon....


Yes! Perfect plan! :likey
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
03 Apr 2019 17:37 #18

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Replied by yamahahaha on topic 1975 DT250 coming back home soon....


Just did a little checking and found that while they do sell mikuni jets the KIT they sell on Ebay is aftermarket from Taiwan
05 Apr 2019 10:47 #19

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Replied by Rimneck on topic 1975 DT250 coming back home soon....

I ordered this one from their site. I emailed and got the same answer you did. I really just want the gasket and O rings for now. I’m hoping to find original Mikuni innards when I open it up. If so, I’ll just clean and reuse.
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05 Apr 2019 17:41 #20

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