shammon

Hi all. I have two pre divvys and today the 900cc gears went stiff as i down chaged at traffic lights. Oil was changed a week ago and plenty in it. Clutch operation and bite is spot on. Gears ok from 1to 5 and back down linkage is ok also What the hell is it i can only asume its the internal gears are either worn or the selector inside is dammaged. Bike runs fine no strange noise etc. Andy