Naw, there are places on the web to actually see a break down of your engine. And there are also paces to buy the FACTORY shop manual that I highly suggest as well. Seems in '73, Evinrude made two versions of your engine. But there are some parts still available for it... Parts are available on here for your engine as well. If you want to see a break down of your engine, go to boats dot com, type in your engine specifics and have look see. If you want any parts, check here for the best buys...