[tkeagle]

Hmm. Tried some larger pilots. 22.5 was in it. Put a 25 in it. Must say there was an improvement. I could step on gas faster, without it dying. However, it idled rough. Had adjust idle screw. But running test, showed improvement. And could feel it on take off. I went ahead and went up one more. 27.5. Again big improvement. Would even peel out, on take off. Never did before. However, again rough idle. Could tell it was rich. Pulled plug. Think plug shows same. Much darker, then previous looks.
Test
#210...25p jets

11.38@29.3@7890
11.40@29.3@7890
11.25@29.3@7900

#210...27.5p

11.13@29.7@7900
11.15@29.6@7960
11.20@30.0@8050
So not sure what to do. Guess will get a smaller pilot, and see if get improvement going that direction. Really like overall performance with larger one. But think it's rich. The idle is really rough with the 27.5. Can actually peel out in very hard dirt. And smash down petal without dying. Hmmmm

Someone posted a link how can advance the timing slightly. Would that help with the idle?

On side note. Thou had some issues at the begging, now where enjoying tweaking everything out. Very happy with the new 175cc from BD. Can see big difference. One can actually peel out from dead stop. Not before. Checked the trail tech after son, took for a few rounds around our so called track. His top speed was 31mph. Before top was 26mph. Only way could get that fast was to take it on dirt road. I even hit 30mph in 110yards. (I know, top speed would not change) And just overall can feel the performance different. My son feels it also.