It started a few months ago. Bike was perfect then one day it became very cold natured. It always cranked but with choke all the way out it would die in idle. Had to give it some rpm a few turns to keep it from cutting off. Warmed up it ran perfect. Had a nail in tire so it sat for about a month. Recently. Fixed that. Oil change did myself. By the book. Went well. Drove to gas station. Right after. On way there I noticed. Best way to describe it. Felt like bike wanted to shut off a few times while cruising rpm. Never did. I come home a few minutes later. Changed air filter. Went to bed. Next day. Went to crank. No luck. I changed the plug. New one. No difference. Took air filter out tried to see if she would try to fire up. No luck. Still gotta check valves. And cam chain. I really hope that helps. I do not want to take carb off bike. But I gotta feeling carb may be the issue. I hear it try to fire. Just not enough to start. Sorry for my long post. I'm basically asking if you guys think it sounds carb related. Sorry I wanted to lay all the symptoms out. Forgive my post length.