Hi Wristpin,
Thanks for the reply. Nothing was engaging so I took the engine off and removed the engine coupling assembly. When I took the 2 gears off (A889 A890) the grub screws in the engine coupling must have been slightly loose allowing the locking bar (R332) to slip towards the clutch assembly and the gears to spin free. All I had to do was tap the bar back, refit the parts and cramp down the grub screws nice and tight and the kick start engaged as it should. So not as big a problem as I thought if something had worn out or broken. Cheers, Mick