Forth gear is gone. Just spent about $700.00 dollars on maintenance parts from Hermy"s. Looks like am getting ready to spend a lot more. Will shift easy from first to second. No problem shifting into third. Going into forth different story. Grind to the max. Got her home riding in third gear. Not going to work today. Called in and really disappointed. Have a good idea am going to be pulling the motor and split the cases. Any input on what went wrong would be appreciated. Phone number to Robertson transmission folks would be appreciated. Might as well get the gears cut. Looks like am fixing to get very busy.