I had a problem with mobil 1 on a '78 suzuki 550, the oil pressure light would come on during hard braking. I switched back to petroleum an no problem.
I think I would wait 2,500 miles minimum to switch to synthetic, all engines are not broke completely at 600 mi., this is just a first service.
I read an interesting Honda Fit forum where the first oil change is determined by the maintenance minder on the dash. The maint. minder will have you doing the first oil change between 5 and 7 thousand miles. This is giving gear heads fits. One guy posting is a bigwig honda service tech, and he claims honda has record of early oil change vehicles that have oil consumption problems due to early oil change. The qulity of the oils plus honda additives dont break down fast enought to warrant an early oil change. Hondas claim is that the engine and ring seating does not begin until the oil begins to break down, causing a little more friction.
I am not suggesting this for the bike. Something to consider. This forum was an automobile, lower rpm engine. I do not personally know the 'honda service tech', and I have not read the honda papers. I do know the Honda owners manual says to 'follow the maintenance reminder on the dash', and 'do not change the oil early'.
I thought it was interesting.