I replaced the pull cord on a Toro 724 snowthrower and screwed the recoil assembly back on to engine several times but cannot get it to recoil. I tried putting assembly back on with the two "keys" extended and inserted back into unit. No luck

Thanks, Gordon

Hi,
Did you pretension the unit prior to putting in the rope? This involves winding it under tension to the point where it stops and backing off one full turn (could be more, but it needs to be at least one) and then putting in the rope.
Peace,
Clarke