honda recon

I have a recon 350 sometimes when I crank it up it will spit and sputter like a rev limiter at 5% throttle I can turn it off and re start it will be normal changed the carb, plug and cdi box

OK... I rebuilt this ATV. Stock top end with stock carb and jets. Super clean... Pilot screw is 1.5 turns out and I can not get this thing to idle. Its starts up for a second with choke on and fluttering the throttle but once it starts its only for a few seconds and cuts off again. If I...