GOOD NEWS. . . . The PICTURE UPLOAD FUNCTION IS WORKING !!! The tech folks at the parent company have been able to remedy the issue. You can upload pictures once again. Thank you for your patience.
Hi,, I got this '79 120 merc inboard with a 17P 15" prop,,, WOT 4500RMP only 27MPH is that correct? 18'fiberglass Glasspar boat! Or what should it do? Thanks
wiserboy <br /><br />30-35 MPH is about all you can expect with the 120 and an 18'er. I would try a prop size of 15-1/4 X 19 and see if you gain a little speed. Bear in mind this will lower your RPM's to about 4100 and reduce hole shot. I don't know the correct RPM range for your engine. Maybe others will chime in and help. Also, this post will probably get moved to the I/O section where more help is likely.
