Oregon 77-307-1 Spark Plug Replaces Bosch WSR5F Champion RCj6Y NGK BPMR7A
Spark Plug    Replaces Champion- RCJ6Y, Bosch- WSR5F, NGK- BPMR7A, Nippondenso- W22MP-U,  Resistor plug - Tecumseh TC300, Stihl Chainsaws