Just did my 600 miles first oil change. It had factory oil in it. I put Honda HN4S full synthetic 4 stroke oil in it with a Honda OEM oil filter. I rode it about 3 miles and had to take her home to take family out to dinner. But it felt alittle grabby and cluncky. I think it just needs more miles on it for the new oil to get feeling right. I remember when I first got the BIKE Honda 919 that it felt the same way till I got 100 or so miles on it and it smoothed out and felt good going through the gears/tranny. Well im off on a 40 mile mountain /curvy ride. I will report back later. Cheers WarDawg