Started with a 165 main and a 72 starter jet. Bike would start but wanted to die if choke off...lots of popping when revving. So I put in a 168 about an hour ago. I switched it out for a 170 and stock starter jet. Starts easier and will idle fine with choke off now. I just took the bike for a spin for the first time in almost a year. Here are the specs as it sits Main 170 Pilot 45 Fuel Screw-2 full Turns Needle 4th from top JD Red Starter jet-stock RD Float bowl with acc pump cover and adj Pilot Screw Pipe-FMF Titanium Header-Stock (but will be putting on power bomb later tonight which will lean it out a bit right?) Airbox-Snorkel removed, high flow filter Ride-I took it up and down the street. I could only go about half throttle because of the area. The bike is insanely fast even at half throttle. The bike was revving smooth and not hiccuping as I increased throttle, but every time I shift gears it would crack and pop, and when I RELEASED the throttle it would crack and pop. So this is where I am at currently. 170 may seem large but its working 10x better than the 165 did. Now how do I fine tune to get this popping and cracking to go away. Oh, TPS disconnected too. So what do I need to do for this decel and gear shift popping/cracking? Thanks yall. One more thing...I have a YZ cam to install but I dont know if that will totally jack up my current jetting or not. It will not be installed for a few weeks though so that I can get used to the power the bike currently offers.