I have stock kickstarter and I also have size 13 feet and only kick it over while wearing work boots or riding boots. My Compression is 145 psi I also don’t have heal guards but I do have full rear fenders and my calf doesn’t come into contact with the rear fender while kicking it over.
Welcome to the site! Are you looking to lower your Banshee like the guys that has them setup for asphalt drag racing or are you just looking to lower the ground clearance a little bit? What type of front shocks are you running?
Jetting the carbs depends on the mods that you have done to your Banshee and your location where you live and outside temperatures. What main jets & pilot jets are you running right now and what is your air screws set at? You very rarely have to mess around with the needle. Also what type of premix are you using and at what ratio?
What you need to do is get yourself either a 18” or 24” pipe wrench and a piece of pipe that is about 2 or 3 feet long and break them loose. Put the pipe wrench on where the wrench would normally go. Also remember lefty loosely & righty tighty. You also might have to apply a very small amount of heat around the base of the spark plugs to help the aluminum expand to release its grip. You should torque the spark plugs to 14 or 15 ft lbs. with either a 13/16 or 22 mm 6 point socket. Good luck!!