[Water Warrior 2]

Agree with Alantf. Try adjusting the chain to the proper specs. It should go quite a bit further if properly adjusted and lubed regularly. I am assuming the previous owner lubed the chain regularly but did not adjust it.
The DID chain is a good replacement when the time comes. Steel sprockets will last longer. You can use aluminum on the rear but the front would wear out far too soon if you use aluminum.