Less technical
Open the engine up, pull the piston out, pull the hollow cylinder (sleeve) out and then by hand if you can push the piston to the top of the cylinder (sleeve) with little to no force you have no (pinch) or compression and the engine will be hard to start. It "should" start to get tight about 1/2 way up.
A sleeve looks like this / \ but not that drastic. It gets tighter as the piston moves to the top.
Leaning it out means closing (clockwise) the fuel screw. Do this = to 1 hour on a clock at a time.