Like Sam said. Sounds like the clutch is frozen. When new, it came with a block of wood to jam the clutch open if you were going to leave it stand for a month or more. The newer ones have a latch pin that will lock the clutch open, same idea. I'd get it in the gear that will send it out of the lean-to while it is off, push in the clutch, and try to start it. The starter may have enough juice to break it loose.