If the #2 piston is on top of the stroke, the intake valve will hit it and refuse to move any further. Don't try to force it, or it might bend. Not likely, since it's almost in a perfect 90 degree relationship with the piston, but it's possible. It's possible to remove the valve springs one at a time and spin the valve stem slowly with a variable-speed drill motor and KROIL or some other strong penetrating oil to dislodge any carbon or varnish on the stem or the valve seat, but it's necessary to prevent the valve from falling into the cylinder.
Take several feet of small-diameter rope such as sash cord, pack it into the cylinder through the spark plug hole, and then turn the crankshaft to push the piston up against the packing. Then the valve springs can be removed and the valve stems can be freed up. This procedure is a lot simpler if the rocker arms are removed first.
Jerry
