General description Carburetor Air Filter Fuel Tube Spark Plug for Stihl MS231, MS251, MS231C, MS251C, MS241, and MS241C chainsaws. This replacement set is designed to enhance the performance of your chainsaw by ensuring optimal fuel and air flow. Technical specifications Compatible with Stihl models: MS231, MS251, MS231C, MS251C, MS241, MS241C Replacement part numbers: 1143 120 0611, 1143 120 0617 Compatible Zama carburetors: C1Q-S295, C1Q-S296, C1Q-S233 Other information