Carburetor Kit / Zama RB-71Pack Size:1Echo 12530013120, Zama RB-71Rotary 13638Echo GT-251, GT-251E, SRM-251, SRM-251E, SV-4B, SV-5C, SV-5Ci, SV-5H, TC-210 and TC-210i; Zama C1U-K54, A; C1U-K81 and C1U-K82 carburetorsEthanol: Not compatible with greater than 10% ethanol fuel