1985 Honda Trx 250 not shifting

Hey guys just bought a 85 Trx 250 today that doesn’t shift gears! apparently its locked in second from what I am told. I have the right side case off and can see nothing wrong visually. any ideas? you can pull up on the shifter and it does "snap" like its going into another gear but feels like it doesn’t quite engage. it will not allow any downshifting movement at all any help appreciated

1985 Honda Trx 250 not shifting

Hey guys just bought a 85 Trx 250 today that doesn’t shift gears! apparently its locked in second from what I am told. I have the right side case off and can see nothing wrong visually. any ideas? you can pull up on the shifter and it does "snap" like its going into another gear but feels like it doesn’t quite engage. it will not allow any downshifting movement at all any help appreciated