Looks like a great trip. Some quick tips.
I see you have Baxter State Park as a destination in Maine. Check the regulations, but motorcycles are prohibited within the park. The rules say 'prohibited on unpaved roads' - the paved roads end at the park entrance.
A favorite place of mine for lobster in Maine is the Harraseeket Lunch & Lobster in South Freeport.
Last time I was up in the Adirondacks, we crossed into Vermont on the Ferry between Fort Kent and Burlington. If you like history, I recommend both the Adirondack Museum in Blue Mountain Lake, NY and the Shelburne Museum near Burlington, VT.
If you do come back through southern PA, there is a really nice B&B in Confluence, PA - the Hanna House. Very close to Fallingwater and the Flight 93 National Memorial.