suzuki bandit 600 1996 chain suddenly gone tight ?

I would check the sprockets,if they are worn you will see that the points on the sprocket are hooked(probably pointing anti-clockwise)that means the chain is not falling into the sprocket but riding over the top making the chain tight,or the chain is stretched,I would change the lot,the problem is caused by fierce pick up when you pull away quickly.

Rich
January 2010