- Jun 1, 2023
My problem is that my Briggs with the 725 EX engine and the air vane/thermostat auto choke system will not run with the choke spring attached. The engine starts first pull but choke will not open with the spring attached and just chokes out. If I remove that spring it starts right up if I push the air vane so it closes the choke plate and when I let go it runs fine. It just will not open the choke if spring is on. It's the correct spring. Got a new carb and thermostat also. Checked thermostat position and it's within the manufacturers specs. Air vane is not binding and not broken. I'm baffled. Any suggestions? Thanks.