This carburetor will work on most STIHL 4-mix trimmer engines models<br> FS100 FS100R FS100RX FS110 FS110R FS110X FS110RX FS87 FS87R FS90 FS90R FS90K<br> FC100 FC110 FC90<br> HL100 HL100K HL90 HL95 HL95K HL101 HL110<br> HT100 HT101<br> KM100 KM100R KM110R KM110 KM90 KM90R<br> SP90 SP90T <br> Replaces Parts No: Zama C1Q-S174<br> Replacement manufacturer part number: 4180-120-0604, 4180-120- 0607, 4180-120-0608, 4180-120-0610, 4180-120-0611<br>