I just purchased a 2006 RM 250 for a great woods weapon... I ride mostly single track and ride fire roads between... Cruizing along a fire road last weekend i go to pound it out in 4th, go to shift to 5th and nothing is there, not neutral, no grinding, just not going into 5th... This Bike was a MX freestyle bike before i got it but the guy i got it from doesn't really know anything about it... as i don't either.. anybody ever heard of a 2006 RM 250 with a 4 speed tranny..? maybe from a RMZ or anything.. I hate to split that case and go through all that... i may just ride it out i don't use 5th too often... what do you guys think?