226/6 problem

Carb may need to be rebuilt again; it is most likely in need of a good cleaning as well as fuel line, and tank if there was fuel left in the system for ten years.

Running rough, popping through carb, can be caused by two plug wires crossed to wrong plugs, check firing order, and wire placement.

Incorrectly adjusted float will cause rich condition, as well as choke not fully opening.

Poor accelerator pump shot will cause flat spot, and popping back through carburetor when under way.