You need to get a Poulan/Husky clutch tool and either make or buy a piston stop. The piston stop is a bolt like affair that screws in place of the spark plug to stop the engine from turning. If you make one, be sure the end that contacts the piston is rounded off and smooth or it will damage the piston surface. The clutch tool will have two pins that fit the outside clutch crossbar and allow you to turn it off in the direction of the arrows.
Broc, February 2009