Only thing i did to the "motor" so far is a Twin Air air filter and a Pro Circuit ti4 shorty. The bike runs like a top, but i was just curious if i should rejet it or not. Here is a picture just for fun.
Jets are cheap and it only takes a few minutes to swap out. Check your plug to see how it's burning and try riding and see which feels better. I re-jetted and could tell the difference in the response hitting quicker.