G'day Renos,
As Wilko says, check for wet sumping, but I definately wouldn't pannick just yet if it's only the second run.
Smoke could also be rich running, when you are opening the throttle, what do your plugs look like after a run,
not after an idle. If it is rings, give it some time, burning a bit of oil isn't going to hurt anything, & it may well
come good, "Good Luck with it",
regards, Cus