Gcv160 Gas Engine "oil backed air filter thing" Questions

...air filter and exhaust and checking the float bowel & putting the carb back I cannot engage the cord. The break is deploying and was working prior to the fuelleakage I serviced the mower before use ...

...air filter the first time I started using it this year. It unfortunately caused the mower to hydro lock which I eventually freed. I changed the oil as fuel had seeped into the oil. I cleaned the fuel ...