I've looked through the various forms similar to this model and don't see a problem similar to mine.
Idles fine. Accelerate and it seems like it's hitting the governor.
Regulator pressure 4 psi. Throttle control pot has one wire at about 1.5v ,the other about 2.5v WOT. Limiting pedal travel with stop bolt helps slightly. Rotating adjustment no help. I'm not equipped with handset or any service materials. Any ideas? Thanks