I will chip in here with additional info and alternative. I mentioned them before - Ricor Inertia Active Suspension
Intiminators.
Link to Kawasaki sizes:
RICOR’s INTIMINATORs
Quote from one review:
When compared to the other major option for damper rod fork help, the Race Tech Emulators, the Intiminators offer the advantage of the easy install and great out of the box performance. The only advantage of the Emulators is their ability to be tuned to an individual rider. The Intiminators have no adjustability, so you’re left with just spring preload and oil level in the front forks to fiddle with. For the majority of riders this won’t be an issue. The improvement is more than enough for everyone except riders needing to finely tune their suspension.
I found the shock performance to be on par with the Intiminators. It did a good job of keep the rear planted on the road with getting overwhelmed by the big stuff. I really noticed the difference on washboard gravel, where the stock shock would pack down and ride like a hard tail over the corrugations. The Ricor shock soaked up those bumps and kept the bike tracking straight, not bouncing sideways like bike did with the OEM shock.
Like the Intiminators I wasn’t bothered by the lack of adjustability. Ricor seems to have found a nice balance in the internal valving that will work for all but the pickiest riders.
Here
a review and explanation how they work
And another review:
March 2015 — Gear Review — Ricor Intiminators and Rear Shock
I am not going to post more links as it's easier to just 'google' them. I've read many people are really happy with them, and I have mine (still on the shelf though)