Thanks Norman, interesting reading. I spent a few hours experimenting today and ended up with a 30 pilot, 370 main, #3 slide and #58 needle on the leanest clip. This sounds to me like it shouldn't work but it does get me the most and smoothest power. On the downside it now won't idle.... I'm still interested in a different needle.
Lo, my 05 husky wr250 is bogging a bit around 1/3 throttle. This is especially noticeable since it's had a fresh top end. None of the supplied needles, 6dj8-58, 59 and 60 or the #3 or #4 slides seem to be able to fix this. Can the jd kit for the cr250 help with this? Same carb I believe. Cheers.