I have a 1990 KTM 2 stroke, and the clutch wont engage. i tried adjusting the screw at the hand grip, but that is already extended out pretty far. i ran the bike 2 weeks ago fine, and then it sat in my garage. I just tried starting it today, but i realized the clutch wont engage. I don't know much about these bikes so im looking to get a second opinion about what i am looking for.