For all the people that say the 2008 setup is the fix - how many have been into how many engines?
It's an interesting situation with the 2008 lever. As we all know, Kawasaki dealers have always said there was never a problem, right? And now they fixed the (non)problem, right? Well, sort of.... The 2008 lever probably won't break. Does it fit well? No...... Will the spring break? No..... Will the spring adjust the slack out of the system?? Not a chance after the first adjustment, and sometimes not even then. The factory spring is far longer than any of the previous versions. The chain and sprockets are the same as before. The location of the parts in the engine is the same. They beefed up the wire diameter so it won't break, and made it too long to work. This is objective fact.
A lot of 2008 owners have change out the parts and reported a smoother and quieter engine. Bottom line - the 2008 parts won't destroy your engine, but they don't work properly either. The loose fit of the 2008 lever will have long term effect.
Below is a pic of my 2008 spring at 327 miles. For those that haven't been into the left side, it's supposed to hook over the peg you can see at the left end of the spring. The spring has actually slid to the right slightly, so you can see there would not be any tension on the spring.
I do make the aftermarket parts. I'm confident if I put the parts in your hands, and could share my experience with you, you'd reach the same conclusion.