this is a 7.5 hp with thunderbolt ignition, it has two blue lines around the head. and a #75 on the head. I would also like to know what the gas oil mixture is supposed to be.
1972 Model<br /><br />More info and parts: Fuel/oil mixture is 50:1. 1 pint of TC-W3 oil to 6 gallons of gas or about 5.5 ounces of TC-W3 oil per gallon of gas. <br /><br /> web page The title on this page:"1970-73 Model Merc 75" really means 7.5, not 75 HP..