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Dt250a , RT1 jet needles??

  • KennyandtheJets
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Dt250a , RT1 jet needles?? was created by KennyandtheJets

Hi guys been a while .. hope u all well.
Trying to find what stock needles and needle jets ran on these models . If anyone has that info be much appreciated.
I have a ported dt250a with race pipe running a 32mm carb off an rt1. It runs woefully bad in midrange . I think mismatched needle and jet is issue.

(Can’t seem to access the dt250a service manual I have used from the technical library before. )
When in doubt, power out !
12 Nov 2020 11:24 #1

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Replied by MarkT on topic Dt250a , RT1 jet needles??

There's a known issue with page 2 of the service manual listings... it's being difficult and attempts to fix haven't worked.

Here's a workaround link the should get you to the manuals on page 2:

yamaha-enduros.com/index.php/workshop/service-manuals?start=21
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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12 Nov 2020 11:57 #2

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Replied by Pedalcrazy on topic Dt250a , RT1 jet needles??

Sounds like maybe raise the clip on the slide needle one notch. Which will drop the needle slightly. Midrange problems are probably the clip position...easy to change and try again.
1978 DT400E
1976 DT400C
1973 RT3
1971 RT1B
1968 DT1 (3)
12 Nov 2020 15:12 #3

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  • KennyandtheJets
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Replied by KennyandtheJets on topic Dt250a , RT1 jet needles??

Running a dt250 needle in a rt1 needle jet probably not helping .. got em mixed up ..
When in doubt, power out !
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12 Nov 2020 17:54 #4

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