Hello, I've got a 03 ltz400 that i can't seem to get started. Will not start with push button or roll starting. It gets fuel, air and spark and still will not start. Valves are in spec and is in time. Went through the carb and cleaned the jets and everything. I noticed that It would start for a few seconds when the choke was on, but then it quit doing that and wouldnt start at all. I even took the air filter out and starved it from getting air and it started up once for a few seconds and nothing after that. I'm running out of ideas so anything would help thanks

 

Does it start when you spray starting fluid directly into the plug hole?