hi, cleaned my bike after the last ride so i know everything was spotless (09 GSA) just come back from 100 mile ride and i've noticed the rear wheel rim is dirty in the centre. no big deal, but it looks like it's liquid thats caused it. i can't see any leaks anywhere, but i've heard about the dreaded final drive. when the seal goes does it spew oil out quickly or does it start as just a mist ? need to have confidence in this bike, going on a 3000 mile round trip in 2 weeks !