Bike is a 2000 CBR 600F4


I stored my bike in a heated garage over the winter starting it up once every two weeks, I just did a oil change and the bike doesn't want to start right away without giving it a little bit of throttle to get it going and this is with the choke pushed down(open?). I know it's still cold around here but it started up just fine before without applying any throttle to it before todays oil change. What worries me is I changed from using mobile 1 10w40 motorcycle oil to Rottela 5w40 T6 . The bike runs just fine once it gets warmed up and I rode it a good 5miles. I'm just concerned about this cold start problem.

 

New oil - a little more dense - predict your issue will resolve itself when the mean/average daily temp rises somewhat and you put some miles on that
oil where it thins out and breaks in a bit