Fork support works fine when used on a KTM65. You have to crank down the front forks a little too far in my opinion to get it to fully function but it does the job. I leave about a little over an inch free play.
I bought this for my brothers bike (rm 85). It is not intended for an 85. I highly recommend going for the full size as the mini pretty much depletes the purpose of having one its so small. The quality seems good. I'm sure it would fit awesome for 50, 65 but not the 85.