I'm new to this site and hope someone can help me. I have a 72 XS-2 650 that I got from my dad who bought it new. Last season I put it back on the road and love ridng it. The problem is: When I went to back it into the garage I had it in 1st gear with the clutch pulled in (engine running) the bike would suddenly lock up! It wouldn't stall, but it wouldn't roll backwards at all. If its in neutral (engine running) it doesn't happen. No one seems to know why it does this, and I'm affraid of a lock up situation while riding down the road. I didn't notice this till after an oil change, any help would be great. Thank you.