Genuine NGK B6HS spark plug. Buy one or buy a box of 4 and save money. We carry them for the MR50 but there are many more applications for the B6HS.
Replaces Honda part number 98076-56710 and 98076-56740, 98076-56741
1974 Honda MR50
1975 Honda MR50
Add greater quantities for an automatic discount