I have rechecked the entire carburetor. The main jet and idle jet was re-cleaned and all of the orifices are re-blown out. It runs the same.

By looking at the carb I'd guess at one time or another it was rebuilt as the gaskets seem in very good shape. My dad said he didn't do it, but his brothers had played with the carbs on the two 77's and 70 on the farm. They had installed the choke butterfly incorrectly, so I'm not sure what else they may have tried.

While the main jet has a larger oriface than the idle jet (so I know they're not switched), what is the normal main jet size? I'm wondering if the jet is too small if it was somehow switched or something?

-Joe Terry