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Installing mercury jet on a G3

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  • Installing mercury jet on a G3

    Looks like a mercury jet shaft is 20", can I put that on my 20'G3 without adjusting my transom? Or will I need a plate to raise it?
    Www.blackriverhunting.com
    Master guide 212

  • #2
    Does the boat have a tunnel?

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    • #3
      No tunnel....
      Www.blackriverhunting.com
      Master guide 212

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      • #4
        You will have to raise it approx. 5".

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        • #5
          Ok...what's the best/cheapest way to do that....? Hit up akmud to weld me a plate?
          Www.blackriverhunting.com
          Master guide 212

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          • #6
            I would just use a manual jack plate.
            Such as this one: http://www.basspro.com/CMC-Manual-Tr...SSSELL_PRODUCT
            sigpic
            www.arcticangler.ca
            https://www.youtube.com/watch?v=Gy_7mPiqoqw&t=11s

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            • #7
              Crud! Them things are over 300 bucks!!
              Www.blackriverhunting.com
              Master guide 212

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              • #8
                Make sure the tip of the jet boot is in line with the bottom of the boat when trimmed down. Then drill the holes to mount the motor.

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                • #9
                  Let me know what you find with a darn for under $300.

                  Tom


                  Originally posted by BRWNBR View Post
                  Crud! Them things are over 300 bucks!!

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                  • #10
                    Lol well I probably won't know if it's worth a darn until I bend the back of my boat hitting the throttle!
                    Www.blackriverhunting.com
                    Master guide 212

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                    • #11
                      Originally posted by BRWNBR View Post
                      Crud! Them things are over 300 bucks!!
                      I used that setup and it was totally worth it. I was able to swap between the pump and prop lower unit. Just liberally apply anti-sieze on all the bolts (I was running in the salt though at times, maybe pure freshwater would be better. After a while I was wishing I had paid extra for the power version at $700.

                      Sobie2

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                      • #12
                        Adjustment is nice....... and necessary if you plan to swap between a jet & prop. If just running a jet I would look at some heavy aluminum angle, 3" X 3" X 1/2". Once you get it set right you shouldn't need to change it. If you have a tunnel you can extend the roof of the tunnel over the foot with a rubber flap. This will allow some grace as to running the foot slightly higher.

                        If no tunnel then a piece of UHMW will help

                        Lifts are handy whether manual or power, and they do allow some fine tuning, however they are heavy and the set back can be a big negative. Particularly so if the bottom is less the 6' wide. IMO

                        And spendy.....
                        "FREEDOM" Only those that are denied truly know what it means.

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                        • #13
                          Originally posted by Akgramps View Post
                          If just running a jet I would look at some heavy aluminum angle, 3" X 3" X 1/2".
                          Like these:

                          A link to an online retailer off of their site is selling these for $143.16 But I think Dewey's Cook Inlet stocks the whole CMC line.

                          Sobie2

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                          • #14
                            I measured then cut a piece of wood the proper height and thickness, then had someone weld for me a riser using 1/8" aluminum shaped like a "U", but squared off-or deep "channel". Inserted the wood to fill the airspace so as not to crush the aluminum when I bolted the outboard on. So I had two bolts through the outboard and height adapter mounting plate/transom described above, and two bolts through the outboard and transom below. It worked happily for many years in that fashion and never had an issue with it. The adapter was long enough overall that I also secured it with two more bolts near it's lower extreme.

                            Put another way; set the riser down over the top of the transom(if memory serves it extended 6" or so below the top of the transom), about an inch from the bottom of the riser I drilled two holes to insert 1/2" bolts with nuts and washers securing it to the transom, then set the outboard on, marked the mounting hole locations on the outboard bracket, pulled the outboard off, drilled the holes then installed the outboard and bolted it down.

                            Just be sure you have the correct height for the jet foot before you drill. BTW this was for a 55hp 2 stroke, factory spec. said it weighed 206lbs and it was on a 16ft Jon boat.

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                            • #15
                              BRWNBR, what size motor, must be 115 on a 20"...? maybe 150.
                              Have you run this boat with a prop?
                              Any issues getting it trimmed?
                              "FREEDOM" Only those that are denied truly know what it means.

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