Sounds like you have most of it, having just brought 2 bikes back to life (83 IT175 and 85 IT200), you should check your exhaust for stuff that crawled in while it sat(one of mine was full of water, rust and ???) and maybe repack the silencer. I also cleaned out the lower cylinder around the crank(nasty stuff down there). Make sure your magneto is clean and dry. Check the condition of the reeds, that's all I had to replace on the 200. Make sure everything has a little oil on it and that it kicks over smoothly. My 175's clutch was crusty and needed a good cleaning. With the heads off, might as well pull the jug and check/decarbonize the piston and inspect the rings.