COMPATIBLE STARTER MOTOR KOHLER MODELS : KT 17 , KT 19 , KT 21 , M 18 , M 20 , MV 20 MODEL - SPECIFICATIONS NUMBER OF TEETH PINION 9 PART NO.: 18270018 ORIGINAL PART NO.: 52 098 13-S , 52 098 13 , 52 098 10 , 52 098 06 SR