DR650 Bogging Fix! This is for the Dynojet kit I found installed in this bike. This is a major issue from what I understand and my discovery is that many of the DR650 low rpm bogging issues are cause by your slide needles dragging in the emulsion tube. In factory stock form the step within the slide on the Mikuni BST40 carburetor makes it challenging to have the slide needle sit straight due to uneven pressure from the slide spring. That spring pressure causes a side load on the needle creating a drag in the tube.

I have seen many complain about the dynojet kit and struggle to find the right settings for low rpm performance. I have seen the "spacer mod" threads but there is mass confusion as to what is going on so this is to clear that up. People your needles are dragging on the emulsion tube causing premature wear and less fluid slide movement causing strange vacuum signals for fueling. The spacer mod does in fact square up the needle when positioned ON TOP the needle clip simply because the spring is then not affected by the step within the slide.

The Procycle needle kit uses the same needle as Dynojet but includes a spacer to sit ON TOP the needle clip to fix this side loading by the spring! Note Figure 3:
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Motolab article going over emulsion tube wear (why do you think this is an issue???)
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I suggest those with the Dynojet kit do this mod with whatever they have available and comment with results. I also suggest those with a stock needle to evaluate how there needles are being pushed to one side causing the same binding. You could create a spacer to hold the stock needle at the stock height and remove the white spacer on top. This would equal out the spring pressure and result in a straight non-bound needle.

Anyway, I hope this video is helpful and sheds light onto what is likely negatively affecting so many DR650s.

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