I have a 2003 Warrior 350. It has a k&n air filter and FMF exhaust pipe. I’m having trouble getting it to run smoothly. It does not idle great and stalls. I have to keep the idle really high. I’ve been trying to adjust the air/fuel mixture screw but that doesn’t seem to be helping. I’ve tried from ½ turn to 2.5 turns out. I’m now wondering if I need to change the jet(s)? I’ve cleaned the carb twice and it helped slightly but didn’t fix the problem. Currently my main jet is 145 and the small jet is 42.5 What is stock jets? Would the air filter and exhaust affect the jetting? If so what jet(s) do you recommend? I’m in Canada in the prairies so it’s low elevation and 70f average temp. Also, if I need to change the jets do I buy one from the dealer, online, or is a kit better?