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Makotosun

DT 400 Dieseling

  • tgill
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DT 400 Dieseling was created by tgill

I have a '76 DT 400 that was just put back on the road after a long sleep and I noticed a lot of dieseling at low RPMs.  She bucks quite a bit in 1st gear before building speed.  What kind of adjustments should I be looking at?  
Thank you, 
25 Jan 2026 16:23 #1

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Replied by Schu on topic DT 400 Dieseling

My 75 DT400 does the same thing. So I’ll be following along to see if you can sort it out. One thing I’ve done that made a noticeable improvement overall was replacing the needle and the nozzle in the carburetor. Many people said the big bore bikes have a substantial pulsation that wears out the needle and nozzle. It made such an improvement that I did the same for my DT250 with similar results. I’d love to do the same on my Dt360 but I cannot find a replacement nozzle.
Schu

CT1B, CT1C, JT1, JT2, CT2, RT3, DT360A, GT80B, DT100B, DT125B, DT175B, DT175C, DT250B, DT400B, Z50

Someday, you'll own some Yamahas
25 Jan 2026 19:40 #2

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