My 01 wr426 just lost fifth gear. I've got it set up for the road with supermoto tyres and I guess she just couldn't hold up to all that strain the road puts on it. I was cruising allong then clunkk!! All she would do is rev. Now 1 st through third gear seem fine, there is a blank spot where 4th was and fifth is now 4th gear. Has this ever happened to anyone. How hard is it to rebuild the gearbox, I know you have to split the cases, anyone have any suggestions?????