The carb fuel filter was the first place I checked, I pulled the carb apart and all is clean and open passages. I guess you could call the bog a “shut off”. If snapped open at idle the motor would just stall, but opened more smoothly would rev fine. If I snapped open the throttle after revving it out, response was crisp. The silencer is clean, I can see straight through it. What would be the symptoms of a leaking seal at the timing shaft, or intake, maybe even cylinder. The setup I am running is what Tom Barth had recommended, and is also run by my competitor. If anything I am setup a little on the RICH side.