Fits Engine Series : 122000 Thru 128000 Replaces Part Number: 790849 Air Vane Spring Compatible With BS 12F800 Thru 12J900, 122K000 Thru 126T000 & 122000 Thru 128800 Series Engines. MONEY BACK GUARANTEE – For any reason you’re not completely satisfied, you can ask for a replacement or full refund, no questions asked.Used On Briggs &Stratton Flat Head Engines With Automatic Choke Systems This The Spring That Goes From The Choke Arm Above Carburetor To The Tab On The Blower Housing That Closes The Choke When Engine Is Cold