Stop at Walmart and pick-up some "Sea Foam" or "Lucas Upper Cylinder Lubricant", both clean injectors and carburetors. I add the "Lucas" every time I fuel.............. don't know if it works but, I add it.
Seriously, you should try it, gives me a really good excuse to tell my better half I gotta run a tank of gas through the boat. I asssume you are already running the "Sta-Bil Marine"
The garbage they sell at the gas stations today is just horrible on small engine carbs, (especially the older models) the alcohol just destroys any rubber parts. (ever wonder why your wiper blades don't last?(on your vehicle)) Also, have ya tried running the higher octane gasoline(s)? Giddy-up-go!!!!! Makes your windshield wipers go like he......
As you know, I'm no expert when it comes to this type of thing but, I did reead the labels on the "Lucas" and "SeaFoam" bottles.
Hope ya make it up this weekend; bring a gas mask and rubber suit (not yellow (please!)), toxic algae bloom.... don't-cha-know?
Last but not least, I live about twenty minutes away and have a tow rope and the "Fish Hawk" is always ready so, call me if ya run into trouble.
Good luck