My question is similar to one posted previously by someone else, but had no response. I have a Mercury Thruster RX28 - 4 speed (Serial #OA293530) which of course was not born yesterday, I think maybe in the 80's and there is very little information available. I thought there might be an Admiral or Captain who could I.D. the lbs. thrust of this unit. My plans are not to use the motor for typical Bass Boat use. I do a lot of drift fishing and intend to use the motor to hold the drift when I hit a hot spot (fish finder) or drop offs for lake trout. If I could find the lbs. thrust, I could ask the next question, will the motor hold a 1984 20' SeaRay in a fairly calm breeze? I don't want to start drilling holes in the boat and later find the motor won't do the job. <br /> <br />Thanks for your help.