Rebuilt vanguard smokes after getting warm
Looking for some thoughts. Recently got a 20hp vanguard that had a broken rod. It looked very clean as though it had very low hours. Found out the cam broke as well, and likely went first, taking out the rod. Cylinders were clean as was pretty much everything else. Got replacement parts and buttoned everything up and it fired right up. After about a minute of running, it starts to smoke. Most rebuilds smoke a little, but this seemed more than what I usually encounter. Full disclosure, I didn't measure end gaps on rings, but I've also never had to adjust any either so it seemed low risk.
I put some oil on the Pistons and rings, and i put some assembly lube on the cylinder walls, valves, etc. Could the smoke be from burning off the assembly lube or is it more likely that the oil rings got goofed up in the assembly?
The engine seems to run good, but I live in the city and my neighbor is a real pita, so I didn't run it for more than a couple min. Let it cool and tried it again with the same result. After a minute, it slowly starts smoking heavier.
I plan to take it to our farm in a few weeks to just let it run for a while and see if it clears up, but thought I'd quiz you guys first.