Carburetor for Stihl Chainsaw. Zamak C1Q-S211B. Models: MS 261, MS 271, MS 291. Replaces codes: STH 11411200601, STH 11411200600 On the STIHL MS 261, 261 C, 271, 271 C, 291, 291 C chainsaws, the Zama C1Q-S211B carburettor code STH/11411200606 has been replaced with the C1Q-S252B carburettor code STH/11411200616 Attention: Check the code. Contact our assistance service to find out the code of the right spare part, telling us the serial number of your machine