Been trying for a couple of weeks to get this bike going. At first it would't even start. I checked the timing and valve clearances and all were good. After cleaning the carb it will start but not run without the choke. it idles fine on the choke and i can snap the throttle with no hesitation. When you shut off the choke it dies. it takes around 10 kicks to get it started. I have cleaned the carb again and it didn't help. I have an adjustable fuel screw with a new o-ring/washer/spring. I am new to 4 strokes so i may just be not letting the bike warm up long enough. My hour meter/Tach shows around 3k rpm at idle with the choke on. My YZ250 takes less than a minute on the choke. i've searched the forum for info and a common issue seems to be the fuel screw. I screwed it out 1 1/2 turns when i installed it after cleaning the carb. It probably needs to be adjusted but i really can't do that with it using the choke can I? May be a dumb question but i am used to 2 stroke carbs and they are a little different. Any ideas? Dirty jets or passages still? I used spray carb cleaner and an air compressor.