Snap goes my drive belt. I had set up the tension,as per instruction found on the 4m, but the bike is new to me and who knows what was done for the previous 12 k miles.So I pick-up a Gates Poly Chain,the good.What? I need to pull the swing arm! Crap,I am missing some of the best ridding weather we have had all year,the bad. Sooo I havehada little oil weeping from the drive pulley from day one and now might be the time to check it out.I set the torque last spring at 125 ft.lbs. with no help with the leak. I pull the drive pulley and find the O-ring on the wrong side of the spacer & the spacer on bassackwords, the Ugly.New parts haven't landed as of today. the weather is still bitchen...Thanks to AllenH for the post on the O-ring check as I would have just checked and replaced the chevron seal and not fixed the leak....Got to go..I think I hear my UPS man...