Yep, carb has varnished up. Those carb sprays won't do it either, you need to disassemble, soak in carb cleaner, and then put a kit in the carb, as R Pope suggested.

When gas sits it is like putting a can of coke out and letting it sit.........everything evaporates and leaves only the gummy residue. An overnight soak in something like NAPA carb cleaner, then blowing out all the passages with compressed air will dislodge it.

Don