Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4201 121 6600 found under Choke Thermostatcarburetoremis by Stihl Inc. The National Stock Number assigned to this part is 2910016968330, and the Federal Supply Class is 2910 Engine Fuel System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 4201 121 6600.