Hi, probably been said before but worth repeating if it helps someone! If you can't adjust your chain, check the brake caliper mounting plate isn't seized on to the back of the hub bearing holder. I bought a tired old 2005 with 63k miles and the rear end was literally caked with crud. I was thinking the hub was stuck in the swing arm but that was ok, when I removed the torque arm the hub was free to move. Moral of story - keep it clean!