before you take off the recoil housing there is a hole with a small pointer at the top. rotate the crank till you see the timing markes through the hole and line up on 0 which i think is mag piston at TDC=Top Dead Center
this lines up the magnets so the flywheel will come off. took me a while to get mine off till i found this out by trial and error.
Wow thats a handy piece of info, wish I had of known that.