Replaces Troy Bilt Colt Model 21A-39M8711 Tiller Carburetor Troy Bilt Colt Model 21A-39M8711 Tiller Shown In Pictures. 2 Year Replacement Warranty! Replace your carburetor if your machine starts up on choke then dies, if it starts with starting fluid then dies or if it needs choke on to run. It’s also a good idea to replace your fuel and clean out fuel lines. Most Problems With Equipment Not Running Or Having a Hard Time Running Is Due To Carburetor Problems. NOTE: Check the appearance, size, shape of this item in our picture and compare with your original one before buying. Generally, we will send the same item as our picture shows. If You Are Not Sure If This Is The Right Part For You Equipment Email Us Your Model Number And Or Engine Number And We Will Look It Up For You. Includes 1 New Replacement Troy Bilt Colt Model 21A-39M8711 Tiller Carburetor. In House Experts: We Know Are Products!