Just to share some experience: I've had my German purchased new WR400F for a two months now and all was great except for the traction - the bike would roost, wheelspin and slide given the slightest chance. I thought what happened to the famous 4-stroke traction? Today I finally swaped the rear Michelin Enduro for the Dunlop 739 - and gone is all the wheelspin! Is there some unwritten law about stock tires having to be crap? You would expect it on XT350 but a race ready WR?