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Almost Ready for First Start DT-250

  • Mark Serotta
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Almost Ready for First Start DT-250 was created by Mark Serotta

 
What should the secondary adjustment be approximately?
So close....
Mark
27 Jul 2022 19:34 #1

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Replied by RT325 on topic Almost Ready for First Start DT-250

Just me, but i'd probably start it with the stop screw backed out then set it when running, Mixture i'd just do the usual 1.5 turns out then see how it pans out. That's without knowing what else is going on in the carb of course. But hope it goes to plan. ps, just be sure the slide is touching right down before atempting to start, plus that it opens & returns--same thing as touching down i guess.
Last edit: 27 Jul 2022 19:51 by RT325.
27 Jul 2022 19:48 #2

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Replied by MarkT on topic Almost Ready for First Start DT-250

Unless you counted the "big" idle screw when you took it apart, there isn't a "number of turns out setting".  You turn it to where idle speed is correct with engine running.

Little screw to right is the one you lightly seat and then open about 1.5 turns or whatever manual says. 
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
27 Jul 2022 20:01 #3

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Replied by Mark Serotta on topic Almost Ready for First Start DT-250

Do I have it reversed MarkT? I back out the small, screwdriver slotted, one not the large spring loaded, thumb screwknow?
Mark S.
28 Jul 2022 12:26 #4

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Replied by Mark Serotta on topic Almost Ready for First Start DT-250

Ok. My mistake, I see the pilot is the right side.
I'll back it out.
Regarding the idle adjust, is it:
"Screw Open" = higher revs?
Mark S.
28 Jul 2022 12:42 #5

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Replied by AirborneSilva on topic Almost Ready for First Start DT-250

Screw in gives you higher RPMs (idle), the small screw is your air screw and should be set a 1 1/2 turns out, then adjusted from there but at this point it's a good start for you.  You need to do some reading on how to tune your carb... 
1976 DT400C
1981 DT175H
1972 DT2 250
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28 Jul 2022 12:52 #6

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Replied by RT325 on topic Almost Ready for First Start DT-250

Umm--thumb screw back it out for safety so it will stop on a closed throttle then once running screw in until you have it idling. But before starting, lightly seat the small mixture screw [screw it in] then back it out 1.5 turns & see how it goes.
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28 Jul 2022 15:18 #7

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Replied by Mark Serotta on topic Almost Ready for First Start DT-250

Update: Couldn't start the 250 this weekend. Plug looked wet, may of flooded it. No leaks from the carb which is good. I plan to put a new plug in and try again.
I sprayed some starting fluid before installing the plug. Anybody else do that?
-Mark
01 Aug 2022 09:59 #8

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Replied by DT400FRANK on topic Almost Ready for First Start DT-250

Dont use starting fluid it has no oil in it. Just put a plug in it and start it like normal. If it's very hard to start, something may not be right, be it human or mechanical :)
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01 Aug 2022 11:01 #9

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Replied by LETSJET on topic Almost Ready for First Start DT-250

If you use starting fluid squirt the smallest amount in the air cleaner, never heard of it added thru the plug hole. I'd be concerned about a runaway. It should pop, no pop, stop and figure out what else it could be. If all else fails, find a old 2 stroke guy and pay the man.
02 Aug 2022 13:04 #10

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