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Dt400 twin-shock carburettor tuning

  • Jammyyammy
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Dt400 twin-shock carburettor tuning was created by Jammyyammy

Hi all,
Does anyone know of a good video or write-up on setting a DT400 twin shock carburettor?
I've got the bike running after fitting a Rex Speedshop ignition.
I've set the A/F screw at 1.5 turns out, but am slightly confused about what to look out for when setting the other screw. I've set the needle height to stock.
Also, what should the tickover/idle rate be?
Many thanks......
10 Apr 2021 13:44 #1

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  • MarkT
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Replied by MarkT on topic Dt400 twin-shock carburettor tuning

Other screw is a throttle stop screw.  You set the idle speed with it.  Turning it in (clockwise) raises the slide and the idle speed.  Manuals in Tech Library have the specs and the procedures if you're still not sure.
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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10 Apr 2021 21:16 #2

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Replied by DT Tim on topic Dt400 twin-shock carburettor tuning

There's some good reading and info in this thread.

yamaha-enduros.com/index.php/forums/74-7...up-to-snuff?start=30
 
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10 Apr 2021 23:56 #3

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