I have two sets of carbs , How can I tell if I have the right needles ? because they are tapered where do you mike them and what is the demention of the best ones? I have had a spare set of carbs and I needed to make a change of one the other day and now I wonder now if I have a ballanced set now and if in fact if they are the needles that I have seen posted here time and tine again. Thanks in advance Gary Portland Ore. One more thing , I used my colur- tune to set the mixture but it seems like I am running lean , I was getting a pop throu he front carb even though it looked good with the color tune , I opened it up 1/4 turn and it seems ok now . Has any one else had this after useing the colur-tune ? thanks again..