I have just got my motor back from having the oil drain hole rewelded ( cracked) i had to remove the cylinder, head, clutch pack, and a few other things to get under couriers weight limits. i have reinstalled all these things put fresh oil in, fired up on 2nd kick, let it warm up, went for a light warm up ride down the road, got into top gear and it wouldn't go down in the gears. so i stopped the motor and tried to get the gear lever to go down the gears by hand it was very notchy and clunky at one point the gear lever just flopped up n down like there was no gears at all, found neutral fired it back up and rode home, it got stuck in top gear again.
I had the motor overhauled less than 4 months ago and all was fine until i got it back this time.
does anyone know whats happening here?