If you can, get some oil in the engine before you start spinning it. After three years the oils left in the engine are gone. A couple drops in the exhaust port and a few drops on each bearing. If you want to real careful, check for loose carbon deposits and remove and clean the cylinder and piston crown.
And then as Karolh said remove the diaphram, check the screen, and when assembling the diaphram, gently massage some oil into the pump flapper diaphram.