Rancher 350ES, new crank, new bearings, new oil pump, new clutch, new cam, new cylinder sleeve bored to 50mm, new piston and rings, head rebuilt (COMPLETE valves,springs, etc.) less than 100 miles before, new piston pin. Took the bike out after rebuild and it ran for about 5 miles then started smoking like mad. Throttle in lower gears smokes out the area then high rpm’s reduces but doesn’t eliminate the smoke. When at idle it will smoke like hell. I am into this bike for to much money to turn back. This problem is what caused me to start the rebuild in the first place.