On further checking, kicking the engine over with the clutch pulled in frees the engine from the kickstart, so the clutch seems to be working. On the other hand, when I pull the clutch in , place the bike in gear and then push it, the clutch does not disconnect the engine from the rear wheel. So the clutch does not seem to be sticking, but it won’t disconnect the engine from the rear wheel when the bike is in gear.