Originally posted by Palmaris Europe
There should be another needle located in the end of the carb that the throttle linkage connects too. This is the LSN (Low Speed Needle) and I believe it is not in far enough making the bottom end rich. Turn it in 1/8th turn at a time and allow the engine to settle (run it around for a couple of minutes) before turning it in further.
Hope this helps.
if it's a tr with a slide carb theres are only two needle settings on the it,un like the novrossi type carbs that have three, high , low and mid range, any ways palmaris is correct in what to do, just was wrong as were to adjust, the low end sitting is in the back of the carb, were the mid range would be on most slide carbs. if it's a rotary carb then the low end setting would be on the linkage side of the carb.