I was talking to the guy who owns this place in Assen at WSB, eventually he agreed to fix a 900ss we had with us that was down to running on 1 Cylinder (pick up on the flywheel) he fixed it in the paddock on Sun morning bless him, but he'd been racing a 900SS with something like 112bhp at the rear wheel, won the twins championship in Holland 2 years running apparently, I had a look around the web-site for details but its all in Klogentash.....
http://www.startwin.com (don't key startwins by mistake like I did, the contents totally different !!)