1984 40hp mariner prop size

[wallynagy]

have 1984 mariner 40hp (6e9) jap model prop has no numbers on it anyware can any body tell me what size came stock or what size will fit this motor i have it on a 16ft meyers aluminum boat looking for best performance (speed not a big issue). thanks wallynagy

 

[steelespike]

Re: 1984 40hp mariner prop size

Welcome,When selecting a prop the motor needs to be able to reach its max rpm rating at wot(wide open throttle)If you read the stickies at the top of the page and the helps at the prop store page it will help you understand prop selectiopn.
Have you looked under the prop nut for a number?Is the boat bare bones or fully fitted?What is the typical load? You should have a tach and a gps for speed to be able to tell if your setup is right.A Tinytach is about $47 and easy to install.They have a web site.