Have you tried swapping plug wires to see if it changes sides. If you're cleaning one carb might as well do both, one at a time as parts are different. Try trimming 1/4 inch off plug wire, re-install boot.
On my son's I pulled flywheel with correct puller (only) cleaned rust off poles of stator and nubs on outside of flywheel to cure one sided miss. Let us know how it goes.
BTW, welcome to BHQ !! Also get a Clymers repair manual or down load a manual !!