From Concord take State St or Rt 3 to Boscawen where you pick up 4 to Andover and then a right on 4A to Enfield which will put you at Exit 17 on 89-
Reverse from the Lebanon area. Lots of scenery and nice sweepers. Tourers will love the lake,, Shaker Village and scenery. Sport bikers will love the tight twisties and wide open spaces.
If you need to get from the middle of the state to the VT border this only adds 10 mins to your drive and keeps you off Interstate 89 (which has been voted one of the most scenic Interstates but everybody drives 80mph). Gas up in Andover if needed and enjoy the several country stores along the route.