This was a great find by MotoCheez on why the Hawk 250 RPS dual sport rear tire would rub against the chain. It seems the chain guide holes are way off from where they should be.  This was a fairly quick tweak to do on my Hawk 250 RPS. I had to do it on 3 other Hawk 250 and it got easier and quicker after the first one.

My hawk 250 upgrades, I have new sprockets, carb with new jets, new exhaust, new chain and digital cluster. If you are looking to buy the upgrades I have, you can purchase them from my shop, click here for hawk 250 upgrades