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Makotosun

1978 DT400 - New Mikuni VM 34-168 with oil injection *working*

  • RamadiRat
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I had to 3-D print my own carb to airbox boot/adapter, that worked great and if anyone needs one, happy to print and ship one.I drilled and tapped for the genuine Mikuni oil injector barb, was very careful, and that went quite well.So now I'm tuning, first, the bike runs much, much better. My original carb was just shot through. She now responds to the air mixture, idle set, etc. Unfortunately I failed to take note of what jets are in the VM by default... sigh. Also, the needle comes on notch two - I now have it at notch 3 (4 seemed worse). My symptom is that at 3000 RPMs, she stops being smooth.. at best I'd say it becomes a bit choppy. I'm not certain if it's lean or rich, just don't have the background/skills to know. I think.. it's going lean so I'm thinking I'll go back to notch four and then focus on the air screw.FWIW this bike is all original (except for this new carb), and in really great shape.Question: Anyone have any experience with this particular upgrade/install? any advice on jetting? I have a complete assortment too to facilitate tuning.
Last edit: 30 Apr 2026 17:47 by RamadiRat.
30 Apr 2026 17:31 #1

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