1983 Mercury 50HP 2-Strok Outboard – S/N: 6307834 – Propeller Question

by Bob
(Lenexa, Kansas)

I’m trying to replace the propeller on my Mercury outboard. I purchased a 24-foot Sun Tracker Party Barge pontoon used. The Mercury outboard had a 48-87818-9, 3-blade, 13 tooth, aluminum propeller. I’m on my second new aluminum propeller and I don’t seem to be able to get the correct size. The new purchased propellers will not achieve the correct WOT rpm (5,000 to 5,500). With the second new propeller, a 3 blade, 12 ¼ diameter, 9 pitch, aluminum and with this propeller the outboard idle at 1,000 rpm and the WOT is 3,000 rpm at 12mph. I realize the pontoon is heavy, but the WOT rpm seems way too low. Any advice will be truly appreciated!

Lenexa, KS

Click here to post comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Mercury Forum.