hi Dan
yeah thats what i thought when i was riding it, i tried it even with my feet of the pegs just in case i was accidently leaning on it but no differance, even ran out of petrol 2 miles from home as i lost concentation, no funny pushing it back !
linkage is fine, so i've just took the gearbox out, first thing i notice is that theres a crack in the gearbox plate at about the 3 o'clock position when installed not far off the selector. looks good hey!
the actual box itself looks ok, i looking at it as an engineer, not someone really familiar with gearboxes, the gears dogs on all the gears look good selector forks look ok and the shift drum ok, and it seems to work.
The crack is perhaps allowing one of the shatfs or selector forks to move slighty under big load and its half cahnging gear. its one thing after another with this bloody thing!!