Not all 2 stroke oil is the same. I'm sure that Kawasaki brand oil is good stuff. Just make sure that it for motorcycles and not some BIA stuff for jet skis and outboards. Some oils run dirtier than other oils and can stick your power valves all up with carbon so that they don't move anymore. Some oils can be diluted quite thin and still protect your engine better than others. Some will foul your plug at a dilution that another brand won't.
I ran petroleum based two stroke oil for years in my KXs and KDXs. But I tried some Motorex full synthetic about five years ago and I run it at 60:1 in all my two stroke bikes. It is the cleanest running, least smokey oil that I have ever used and when I went to change out the piston and rings after four years of trail riding on my 2001 KDX220, the top end had very little wear, blow by or carbon in it anywhere. I only change the spark plug when I rebuild the engine, and I only do it then because I'm putting all the other new stuff in. The Motorex does cost a lot of money, but I like what it does for my engine. Besides, it smells wonderful when it's burning. :cool: