I went to down shift for a stop sign and it felt strange. when i went to take off i could tell i was not in first and could not get it into first. seems like i had two gears 3 and 4 got it home and shut it off and i can get all 6 gears by rocking the bike back and forth. their seems to be alot of slack in the shifter when moving it up and down. the linkage arm on the shaft coming out of the tranny is tight so its not slipping there> any thoughts??