I have a 1994 RMX 250 that was purchased with the engine and transmission completely disassembled. It was in need of a complete rebuild which I did. It now runs but what has me stumped is the transmission... the gear shifter moves freely and you can feel it changing gears. In neutral you can roll the bike and when you shift it into gear you can feel it's in gear when you try to roll the bike although it does push easier than it should (example: when you push it in first gear it rolls as if it were in fourth or fifth gear instead). With the engine running you can shift through the gears but it's like nothing engages in the transmission.