I just picked up a 1985 honda fourtrax 250trx. I finally got it running good and was riding it around my property i shifted from 2nd to 3rd and all the sudden it acts like its in neutral i can't get any gear. I checked the shifter its self and it seems to be shifting and i can feelthe drive shaft spin through the boot. I'm at a loss any help would be great. This is my first post thanks for any help.