Lloyd Louise Rees
New member
Hi, I have been looking at old posts and am hoping I can get some help here. I have a 2stroke 1980s 40hp mariner on the back of my 16 foot 6 Broom Aquarius speedboat. I tested her for the first time on the weekend. I am only getting 11knots out of her at full throttle. I feel this is a little slow and so plan a tune up. This I am happy with but prop choice I have no experience with. The prop supplied is pretty shabby so I am looking to change it. The only markings on it is PR505 a sixth digit/number is unreadable. My thoughts are that the prop may be no good for my set up. Any thoughts on what my prop is and what prop I should receive would be gratefully received.