Possibly a bit of oil burning. Do you need to add much oil between oil changes? If you have to add a quart or so bewteen changes I might worry a bit. If you add a few ounces between changes it's not enough to worry about.
Does it do this all the time or just at start up and stops when it gets warm?
If just at start up it's not a real big problem. If it does it all the time, it's a bit more of a problem.
When you ride with a group do the riders behind you stay way behind you? Like 1/2 to 1 mile. Then It may be a problem.
Often on a fresh rebuild a bit of oil burning can occur until the rings get well seated. My 750 kit is smoking a bit on start up, more on the left but stopps as the bike warms up.
I only have a few hundred miles on it. If it keeps doing it after 500 to 1000 miles I might start to wonder.