How about some more details about the top end overhaul?? Like it was bored out, valve job, new valve seals etc. Or was it just a hone and re-ring? Also does the smoke smell like burnt oil or rich like too much gas, is the plug wet or dry?? The more you can lay out here the more direct of an answer you might get.
1985 Honda 125M (My first Trike--Still have it)
1986 Honda 250SX
1981 Honda 110
1982 Honda 110
1986 Yamaha YFM80 (Sons quad)
Past rides: 1983, 1984 200X, 3--1985 Kawasaki T-3
1987 CR-80, 70's vintage XR75, RM 370