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My 1987 Force 85 HP and its Propeller

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  • My 1987 Force 85 HP and its Propeller

    I am starting a thread here hoping one of you fellow Force owners have the same set up as me or close to it. I have a Bayliner 1990 Capri Bowrider. The boat measures close to 18 FT if you include the built on swim platforms. The max HP the boat calls for is 90, I have a 85 HP on it, 1987 Force to be exact. I hit a rock/concrete in the ship channel North of Trinity Bay Texas the other day. The prop has the numbers A625265 PS625 stamped on the hub. On the side of the prop it reads 13 <RP> 17, the number 7 looks to be stamped over another number as it is bigger than all the rest of the numbers. Then directly across from that stamping is the number 19 all by itself, small than the numbers above it though. My thoughts are it was a 19 and was reworked to a 17. Anyway my WOT was 4750 RPMs at 30 MPH with myself, wife, 2 small kids and full tank. Here is where is gets weird.... I found another prop that reads 15 C on the side and A665265 PS665 on the hub. I assume a 15 pitch that is cupped. I tossed it on my boat and went out. The numbers were as follows, WOT 4100 RPMs and 30 MPH with myself, half tank. I made another run as I had to make sure I read the tach right and yep 4100 RPMs with myself and my son, again 30 MPH. My speed is the same with BOTH props yet my RPMs seem to drop with a lower pitch prop, HELP!

    I am lost, all I thought I knew is gone out the window. I can add pics if needed...

    thanks'
    cordell


  • #2
    Re: My 1987 Force 85 HP and its Propeller

    If all you get is 4100 RPM with 2 different props??? How is the motor running?Do a compression/spark test.This rules out any possible problems.
    You should be revving up to 5500 optimum.
    625 is a 19P/c Not real sure about the other.Sure it's not 685 not 665?What condition is the 19? How about the 15? Answer this and get back to us.J
    IF YOUR OUTBOARD DOESN"T START WITHING A FEW SECONDS THEN SOMETHING"S WRONG!!!!

    Other websites are NOT the place to buy parts.They managed to screw up my last 4 orders.
    NO communication,NO follow through. Incompetent staff.Nuff said!

    Buy American made Cars and Trucks!!!Towing insurance for a boat,a GREAT thing.

    If you fix your problem,do the rest of the posters a favor and send in one more post telling who,what, how it was fixed.J

    88 Bayliner 21CC Twin 85hp Forces.

    Comment



    • #3
      Re: My 1987 Force 85 HP and its Propeller

      Motor is running fine..idles has good hole shot, reaches 30 mph as it has since I had the boat. Big boat for this motor, my thoughts is a 120 hp would be better though bayliner rated it at 90 hp...

      With the original prop (first pic) I was 4800 RPMs and 30 MPH. That is the prop I hit a rock/concrete with. It is beyond repair. It is stamped A625265 PS625 and look at the stamping on the side, you see the number 7 looks to be stamped over another number? Also the number 19 is stamped below but upside down in relation to other numbers....

      What has me really stumped is WOT is 5500 RPMs for this motor. I was at 4800 RPMs with the 17 pitch I figured putting the 15 C on would/should raise the RPMs NO?

      Below is Bad Prop 4800 rpm and 30 mph (hit rock/concrete)


      Here is the prop that is 4100 RPMs stamped 15 C but still has hole shot and 30 MPH just as before I hit the rock and switched props. It is stamped A625265 PS625 on hub/bearing. This prop is in fairly good shape. In fact it is in better shape than the above prop before the rock.

      This is prop that gives 4100 rpm and 30 mph

      Comment



      • #4
        Re: My 1987 Force 85 HP and its Propeller

        Originally posted by jerryjerry05 View Post
        If all you get is 4100 RPM with 2 different props??? How is the motor running?Do a compression/spark test.This rules out any possible problems.
        You should be revving up to 5500 optimum.
        625 is a 19P/c Not real sure about the other.Sure it's not 685 not 665?What condition is the 19? How about the 15? Answer this and get back to us.J
        I examined both props again...PS625 does come back as 19 pitch as you said. This is the prop that I messed up, the one with the 13 <rp> 17 stamped on it. But look closely and you will see the 7 in 17 appears to be stamped over the original 9 or 19. Also 19 is stamped below it.....

        The PS665 is in fact PS665, I can not find ANY info on this prop. The only thing is the 15 C stamped on the side. Examining the prop closer it looks like one of the blades is not machined the same as the other two. It looks more flat and not as curved if you will. Its hard to describe but it doesnt seem right. Even if one blade was/is off would that cause RPM to be lower than the 17 pitch (or 19, not sure due to stamped numbers) RPMs? I lost 700 RPMs between the 2 props!

        Comment



        • #5
          Re: My 1987 Force 85 HP and its Propeller

          That 15c should have pushed your RPMs way up not down.
          Did you do the comp/spark test?
          Is the boat left uncovered with the plug left in?Possible soggy foam adding weight.Do the test and post your results,J
          IF YOUR OUTBOARD DOESN"T START WITHING A FEW SECONDS THEN SOMETHING"S WRONG!!!!

          Other websites are NOT the place to buy parts.They managed to screw up my last 4 orders.
          NO communication,NO follow through. Incompetent staff.Nuff said!

          Buy American made Cars and Trucks!!!Towing insurance for a boat,a GREAT thing.

          If you fix your problem,do the rest of the posters a favor and send in one more post telling who,what, how it was fixed.J

          88 Bayliner 21CC Twin 85hp Forces.

          Comment



          • #6
            Re: My 1987 Force 85 HP and its Propeller

            I was running fine when the broke prop hit the rock, I brought it in right after that. I went back out the next day with the 15 C. I have pulled each plug independently and when done the motor idles very rough, replace wire and idles fine. I havent done a compression but will do if you think that might be the issue. My thoughts are the 15 C would raise RPMs as well, should that 15 C be a tighter shape. It is almost like the blades are straight out. And if compression was low or no spark wouldnt I drop in speed as well as RPMs? I still hit 30 MPH (gps) as fast as I did before. This has got me all messed up! lol I did not buy either of these props new, they are both used with no prior history known...

            Comment



            • #7
              Re: My 1987 Force 85 HP and its Propeller

              I wonder if the "cupping" on the 15 pitch has anything to do with your lower RPM's.

              Comment



              • #8
                Re: My 1987 Force 85 HP and its Propeller

                I bought a compression tester this morning and was stressing the results all day! Well here they are.....

                1. 119
                2. 122
                3. 120


                WoW! That is FAR better than I hoped they would be! Still I have a issue, it has to be that prop That 15 C must be way out of wack or something, right? The day before I messed the 17 stamped prop up I was 4800 RPMs 30 MPH. Broke prop and went straight in and came out the very next day with this 15 C prop and dropped RPMs to 4100 but still 30 MPH. I know it dont make any sense, but its what it is.

                Comment



                • #9
                  Re: My 1987 Force 85 HP and its Propeller

                  Originally posted by Mark9740 View Post
                  I wonder if the "cupping" on the 15 pitch has anything to do with your lower RPM's.
                  The thing is they dont look cupped. They look almost straight, one of the blades is straight. Both props are a bit shady, the one I messed up was a 19 originally, modified to a 17. That 15 C should have raised my RPMs and lowered them instead. No Clue For all I know is the 15 C could have turned into a 21 pitch! lol

                  Comment



                  • #10
                    Re: My 1987 Force 85 HP and its Propeller

                    Do you know anyone with a prop you could borrow? I have to say the 17 sounds about right for your boat.

                    Comment



                    • #11
                      Re: My 1987 Force 85 HP and its Propeller

                      They don't have to have a curve in them to be cupped.Like mile says get a different prop.A 17 should give good performance.
                      Some dealers have used props laying around.If you tell them the story and you'll buy one from them, they might loan you one to test with.J
                      IF YOUR OUTBOARD DOESN"T START WITHING A FEW SECONDS THEN SOMETHING"S WRONG!!!!

                      Other websites are NOT the place to buy parts.They managed to screw up my last 4 orders.
                      NO communication,NO follow through. Incompetent staff.Nuff said!

                      Buy American made Cars and Trucks!!!Towing insurance for a boat,a GREAT thing.

                      If you fix your problem,do the rest of the posters a favor and send in one more post telling who,what, how it was fixed.J

                      88 Bayliner 21CC Twin 85hp Forces.

                      Comment



                      • #12
                        Re: My 1987 Force 85 HP and its Propeller

                        Well here it is, my Michigan Stainless Steel 17 pitch prop! It arrived 15 minutes ago. The only drawback is I have to go into Houston in about a hour, and when I do get home my wife has my truck at work She drove it to her work because it is 6 miles from the house. Houston is 35 miles, got to conserve gas so I got her car, a 4 banger chevy. I wanna hit the river! lol First thing in the morning I will get some fresh numbers and report on my new prop.

                        Thanks Everyone
                        cordell

                        Comment



                        • #13
                          Re: My 1987 Force 85 HP and its Propeller

                          Dat sho am purdy! Now you're going to have to take it with you every time you leave the boat
                          When goals have no clear focus, neither will the actions of the people trying to achieve them

                          Comment



                          • #14
                            Re: My 1987 Force 85 HP and its Propeller

                            Originally posted by foodfisher View Post
                            Dat sho am purdy! Now you're going to have to take it with you every time you leave the boat
                            Is that to prevent theft? I have my boat at the house on 1 1/2 acres. Although that didnt stop thieves from back up to my shed, busting the lock and running off with about $5000 in tools! Since then I have got a alarm for my home, shed, and a security camera that points towards the shed and my boat. I HATE THIEVES! I will be taking it off after every outing though, lol.

                            Comment



                            • #15
                              Re: My 1987 Force 85 HP and its Propeller

                              Ummm,i think i can help you with that prop problem,just send along that SS prop and i will give you a report on how it works with my 1985 85hp force on my 16ft fish&ski sorry i don,t have a tach but i can give you mph readings while out on the water,oooh pretty shiny props can,t help myself...... aaahhhh.

                              tom

                              Comment

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