Go to the just kdx web site and rejet as it says. Also lots of good info there.
http://justkdx.dirtrider.net Go there and learn.
Yes, rejet it makes a huge difference. As far as oil and ratio goes, do a search
on the subect and prepare to be overwelmed by posts.
I would say a large percent of people use a synthetic between 32 to 50:1.
I do not mean to start a long oil post, just search and make up your own mind. And yes, by changing your ratio from 32:1 to 40:1 you made it richer.
Less oil ,more gas=richer.
The 200 and 220 are both jetted verry rich from factory.
Steve