I just remembered this...
My late father bought a Farmall Cub tractor that had been kept outside without an exhaust flap on the vertical exhaust pipe. Little engine was rusted up and would not turn over.
Trailered it to the Massey-Ferguson shop in town where an older and well-experienced mechanic removed the flat head and poured Coca-Cola into the cylinders. Few days later, the engine was free enough to crank. Cleaned out the sump, bolted the head back on and mowed pasture for many years.
As a class science project in grade school, we kept a piece of steak in the Frigidaire with a daily top up of Coca-Cola on the meat. The drink eventually ate a hole clear through the raw meat. Dazzled my little pea brain, it did. Became a "Pepper" after that.
Maybe soak the carbs in Coke. Simple. Kinda like our BMW "tractors"
