lurches

My 1990 Max has been giving me problems since mid-last summer. I'm a daily rider but learning to wrench as probs arise. Not the best situation but it's reality. So... I've had a charging problem since spring last year. Bought new battery and all was well for two weeks or so. Then the new battery...

I know there is a thread in here that has information on this subject, I just can't find it again. When I shift into first gear the bike bumps forward with a loud clunk. It has 3,500 miles on it a 2002 stock. It will do it every time. Do I need more miles on it to loosen it up? Thanks for any...