On a new bike changing the oil between 20 - 50 miles is a very important step. It's true that about 5 minutes after the bike is at full operating temp the assembly lube is washed away into the oil as it has accomplished its mission....to allow the engine to start without galling or spinning bearings. If you don't believe this is a good idea then follow these steps.
1) Drain oil at 20 - 50 miles.
2) Attach rare earth magnet to some string.
3) Drag the magnet through the drained oil for a minute or so.
4) If what you see attached to the magnet makes you happy then put the oil back in the bike. (Pour through terry cloth if you can't get magnet and string).
5) If what you see blows your mind in complete disbelief.....then put new oil in your prized possession.
6) New filter too.
The amount of bearing surface, ring material, and other stray metal particles that come loose in the first few miles is amazing....even to experienced engine builders. Don't get me started on the crap that comes loose from the casting process.
I change my oil AND filter in new vehicles at 20 miles, 100 miles, and 500 miles. Then I follow regular intervals for life of motor.
No synthetics for me until at least 5,000 miles.