Hi,
The Kouba link works well I have used one on my 06CRF250R. You will also need to slide the forks up about an inch. Only thing is u might get a bit of head shake. I sometimes take it off as it works well on some tracks and not others.
There are 2 that will fit the CRF250.
Also make sure the sag is set correctly. If you don't get the correct sag you might need softer springs. The CRF is designed for a 75kg rider.
Also if you can change the inner chamber fork oil from 5wt to 2.5wt, makes the front more plush.
I came across a website called
www.speedmetaldesigns.com which sells a subframe lowering kit.
also you can cut the seat foam by one inch.
cheers
Tony