The 90 has little barbs on is and you're basically ripping the aluminum up getting it out. The KTMs use the hole we need but I have a DR650 carb here.įirst thing you do is remove the top, spring, slide and needle/ Then stick something big and solid in the 90 and twist it out. The good thing is the place it needed to go was already casted in the housing (blue arrow) and just needs to be drilled out. All the credit goes to him.įirst thing we need to do is move this big 90 degree elbow (red arrow) that feeds a breather for the slide. The following intructions and pictures have been copied (and some edited slightly) from ATJ_Number_1's original thread and Facebook page. The original thread where all of this information came from (and where the performance results can be found) is located HERE. I suggest reading the original THREAD, as there is more info in there pertaining to the KTM version of the BST40 and various jetting recommendations. If using one from a KTM, the vent line modifications aren't needed so you may want to research exactly what needs to be done, in that case. These pictures and instructions apply if you are using a BST40 from a DR650. I thought I'd take the time to try to put it all together for anyone wanting to do this in the future. Luckily they are all available on his Facebook page, but do not have all the captions with instructions. Since his original post, most of the pictures aren't showing up. First of all, I would like to thank ATJ_Number_1 for taking the time to figure all of this out.
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