hello larry's
thank you very much for answering, really
Yesterday after publishing my comment asking for help I decided to disarm it completely
, this problem of locking the gearbox happened to me the other day when I decided to change the oil in the box, and not to remove the old oil and put the new one decided to clean it with another cheaper oil, then, I took out the old oil I put the oil grade 30 (common oil) I started it and try some changes and everything was perfect, once I was clean all the plug of the oil drain had two washers and take out 1 washer, then the screw was more long and when pressed it made a priority with the selector of changes and there the problem started, I took the plug and still locked, disarmed yesterday the engine and what is the gear selector was fine as the forks, the only thing that was bad were the bearings of the primary and secondary axis that were broken