Troy Bilt Auto Choke System . It has an auto choke system and it isn't fully disengaging or opening after it starts up. Some small yards and buyers are perfect for a push mower like this troy bilt model. Manual for Honda 160cc engine on Troy Bilt 11a542q711 lawn mower? from www.justanswer.com This is causing it to run very rough and fouling plugs. With its innovative cutting system and its durable. I just had my first experience with the new briggs automatic choke system.