On my classic engine Sixty-5, I perform the standard oil change process but have the spark plug removed.
Keeping the spark plug grounded, I spin the engine with the electric starter a few times - but never more than about 5 seconds per interval.
After re-installing the spark plug and starting the engine, I let it idle for about 5 minutes. Shut it down for 10 minutes and recheck the oil level. Adjust the level to the center of the dipstick range - go ride.
Regards, Foggy