Ok, My Ninja is running a bit rich.
I changed the plugs and cleaned the airfilter without any real change.

(It was back firing on me, not all the time, but when it did it was bad, the spark plug on the number 1 cylinder seemed loose)

As it is warming up outside, (I have had this bike about a month), it is getting harder and harder to start.
A lot of fuel smell, IE make sure your in a well ventilated area.

How should I try to correct this issue.
Drop the jet size, but by how much?
1 size, 2 sizes?

Maybe just get an aftermarket slip-on to lean it out? Currently it is running the stock can?

It started pretty easy when it was 40 degrees or colder outside, but now that it is warming up it is getting pretty difficult to start. Even if it is all ready warmed up.

Also, If I try to ride it without it fully warmed up, it backfires and or stalls on me.

Thanks,