I no longer use Sta-Bil. It makes the exhaust stink too much for me. I have been using the Lucas fuel stabilizer.
I have found a gas station that sells "Clear Premium" that is ethanol free. Ethanol is bad news. Fill the fuel tank to the very top to reduce condensation collecting above the fuel level. Close the fuel petcock & drain the carb bowl(s), or at least run the engine until it runs out of fuel.
Change the oil & filter. This will help remove any condensation, acids, etc, that have accumulated in the old oil.
Remove spark plugs & give each cylinder a shot of oil, then rotate engine to cover cylinder walls. Replace plugs with new ones if needed.
Try to support the bike so the tires are off the ground, or at least use the center-stand if the bike has one. Over inflate the tires slightly.
Consider removing the battery & storing it on a piece of wood in a fairly climate controlled atmosphere. Buy a 3/4 amp Battery Tender if you don't already have one. Use it every couple of weeks, once a month, or so.
Plug the exhaust outlets with plugs, rags, or rubber band a plastic bag over the end(s).
Clean or replace the air filter. Plug the air inlet if possible.
Beware of rodents & insects taking up residence & chewing things up like the wiring.
Every once in a while, walk by the bike & turn the wheels, rotate engine if you have a kick starter, or place in high gear & turn rear wheel. Exercise the brake levers, pedals, shifter & clutch, to help keep seals & hydraulic lines in good shape.
I don't agree with spraying anything with WD-40. WD-40 is not a preservative, it is more of a solvent. The "WD" stands for Water Displacement. I have bought a gallon can of WD-40, mixed it 50-50 with clean 30WT or 40WT engine oil & then poured it into a plastic spray bottle like what is used to mist plants, spray household cleaners, etc. That makes a good preservative for bare metal, freshly machined surfaces, etc. The oil adds enough body to cling to the surfaces. The WD-40 allows it to be thin enough to spray.
These steps have worked well for me on my bikes & I haven't had to clean a carb in a while.
Good luck.