Stihl 021 023 025 Carburetor replaces Walbro WT286 Zama C1QS11E Quality Aftermarket Carburetor Replaces Walbro WT-286 (WT-286-1), WT286 supersedes to WT856 Replaces Zama C1Q-S11E, that number now supersedes to C1Q-S11G Used on Stihl chainsaws, check carb to see if it ione of the numbers above.