User Tag List

Thanks Thanks:  0
Likes Likes:  0
Results 1 to 3 of 3
  1. #1
    Join Date
    Mar 2019
    Location
    Saint Louis Missouri
    Posts
    1
    Thanks (Given)
    0
    Thanks (Received)
    0
    Likes (Given)
    0
    Likes (Received)
    0
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    1999 Mariner 45/90 Jet increased performance

    Hello all! I currently have what I believe to be a 1999 Mariner 45/90 3cyl. jet (received from my grandpa on an 18ft jon boat) . The boat hull is in pretty rough shape so I was kicking the idea around of putting it onto another hull (more of a cruiser than fishing). I have seen some videos of 2 strokes being modified to produce more power and higher top speeds. Due to the age and what I want to do, I was planning to overhaul/modify the motor. Any good threads on something similar? Also any pointers or guidance would be appreciated! I'm currently working on getting the serial numbers off the engine (it is located about 2 hours away from me currently). It will run about 28 mph wide open with the jet, any ideas on how much speed will be gained with a prop swap? Thank you in advance!

  2. #2
    Join Date
    Jul 2011
    Location
    Gloucester, VA
    Posts
    900
    Thanks (Given)
    13
    Thanks (Received)
    55
    Likes (Given)
    73
    Likes (Received)
    189
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Best solution would be to put a normal gear case on it.

    On a serious note. Look at setup. Cant tell you haw many jet drives come through here buried all the way down.

  3. #3
    Join Date
    Oct 2010
    Location
    Harrisburg,Pa
    Posts
    1,760
    Thanks (Given)
    2
    Thanks (Received)
    18
    Likes (Given)
    14
    Likes (Received)
    54
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    That's a 3-cylinder it would be a 60/45 that is a 60 horsepower powerhead converts to 45 horsepower at the jet. You could gain up to 10 miles an hour with a switch to a prop but the jet motor is a 15in so you'll need to lower the motor to put on a lower unit and there will be issues with the shift shaft since the jet does not use one.





Similar Threads

  1. 1999 mariner 135 optimax dfi... Rpm studder at 3500rpm
    By Blakes in forum Four Stroke and Direct Injected Two Stroke Engines
    Replies: 8
    Last Post: 04-27-2019, 11:17 PM
  2. Replies: 4
    Last Post: 04-18-2019, 03:06 PM
  3. Mercury Tech: Building a 1999 XR4 from ground up and need performance tips and direction.
    By fishnguy740 in forum Technical Discussion
    Replies: 1
    Last Post: 08-28-2016, 01:07 PM
  4. 1999 Mariner Offshore 3.0 225 hp EFI (lefty)
    By speedfreak2030 in forum Outboard Engines
    Replies: 2
    Last Post: 07-09-2015, 04:27 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Bob's Machine