yes, also looked carefully at the 4 low speed pin holes below the welch plug and no clogs.

T2Stroke, Fleetwin, FrankR….opinions?

My hunch is a tired carburetor that cannot be rehabbed by conventional methods. I mean, a casting that is 44 years old gives up eventually….

I would say the high speed circuit could be wrong, but if some jack@$$ ran a drill bit through the high speed orifice, the motor would run too rich not lean with too much fuel.