Champion RY4C Champion RY4CT10 Dolmar 965603030 REPLACES: EFCO 3055120 JO HN DEERE TY26712 OREGON 77-252 STENS 130-224 and others FITS: - Stihl FC 83, FS 83, HL 73 - and others SPARK PLUG INTERCHANGE CHARGE USE THIS CHART TO...