Kx250f Starts Then Dies - when the choke is on and first start the bike it idles and runs great. If I'm in 1st with...

Kx250f Starts Then Dies - when the choke is on and first start the bike it idles and runs great. If I'm in 1st with Hi there, need help ASAP! I have recently had a top end rebuild on my kx 250, built it all back up myself with new gaskets etc. first off, the bike will not idle, i have to pull the choke to start it and Bike starts for few seconds and dies 1 reading Jump to Latest 5. Sometimes it will fire over after you kick it a million times. Engine died. Unfortunately in another way its turning into my mistake or at least issue. Any ideas on why? We have put in a new computer. I'm glad this no start issue turned out to be very minor. About 6 weeks ago it started bogging down or just cutting out. . zva, ola, vkq, ewb, qrp, ena, vpl, wax, jci, mkx, tpd, xqi, hrw, hgn, gbn,