My 1980 R100T has some peculiar front end behavior at speed. Once I get up to about 70 on the highway, the front forks begin to shake. If I look down at them, it appears that they are shaking from front to back, and not side to side. The handlebars don't really shake form side to side either. It is not violent, but definitely not something I can live with long-term. I should also note that the forks tend to bind a little bit; i.e. after I stop,and I get off the bike, the front forks will spring back up after a delay. I know that I need to make sure they are aligned etc. and have not taken steps to do this yet. My question is does this shaking behavior point to any particular problem? Thanks.