I know that everone and their momma knows this, but I figured I would put it in writing for anyone who is new to bikes. If you find that over time your motorcycle requires more effort to push forward or backward when it's not running, then its time to check your tire pressures. In my experience a tire down as little as 4 psi will cause a significant change in how the bike moves. Now obviously there are several other culprits that can cause such a condition, but your tires are the easiest and first thing you should check. I know I'm gonna get flamed for posting such noob advice but if it helps someone else out, it was worth it. Take care fellas.