Originally Posted by Jammin
@BergDonk: I checked the ignition coil connector, looks good to me. I installed my spare coil yesterday and bike was running for a bit. When this problem first surfaced, my first thought was a fuel starvation issue. I opened up the carb and saw that the float needle wasn't that smooth in its jet, so I lightly sanded the jet, got better motion for the float needle, but problem persists. What else in the carb should I look at? I have a Mikuni TM38 flat slide. I had it rebuilt before I left Nairobi and replaced the slide, float pin, air screw and reseated the float needle.
I'm not familiar with the TM38. What sort of filtration setup do you have? The fuel taps will likely have filters in them inside the tank. I remove them and just have a single in line servicable filter on the way to the carb. Do you still have the stock inline filter that sits in the intake pipe on the BST? I aslo routinely run on reserve so any accumulation of crud in the bottom of the tank gets flushed into the filter.
Does the float bowel have a drain valve/screw? If so, if you can get a piece of clear tube and attach it to the drain and leave the valve open and route the tube up so you can get a visible float level. Then when it stops, check the level in the tube. A manometer arrangement and it should be enough to tell you if itsa fuel issue.