Do you have a heat gun? If the piston is so tight in the sleeve it won't move, then you need to heat the engine up so that the sleeve can expand a little to make it easier to start. Also, you will need to use After-Run/Marvel Mystery Oil instead of WD40. I have personally had much better luck with the After-Run oil over WD40 when rebuilding/storing engines.
It's not what you know; it's what you can prove.
The only thing that is for sure is that nothing is for sure!!!
The needs of the many outweigh the needs of the few, or the one.
There are 2 things in life that are infinite: the universe and stupidity.