Chris,
The kickstart ratchet is mounted on a sleeve on the back end of the layshaft. Sometimes this sleeve gets swollen if the nut is overtightened - thus preventing the ratchet from dropping back into engagement. Having said that, if the kickstart engages occasionally, I would be inclined to live with it. If your bike has been laid up, it might just be a bit 'gummed up', and with use, should free up and operate correctly.
Regards,
Eddie.