Results 1 to 8 of 8
  1. #1

    Join Date
    Oct 2021
    Posts
    4

    2009 RXT IS255 sounds like a diesel

    Hi,

    New here and wondering if anyone has any ideas on what might be making my motor sound like this. Iv recently transplanted a 2009 Seadoo RXT IS255 into a 12 foot aluminum jet boat. Everything was running perfectly until a couple of days ago when it started sounding like a combination between a diesel and a tractor. The motor only has 39 hours on it.
    I pulled the valve cover and all the springs and rockers look good. I stuck my fingers in the supercharger and I can not freely spin the supercharger, which from reading forums sounds like it is not the washer? I did a compression test and cylinder 1 is down.
    Cylinder 1- 80psi
    Cylinder 2 - 120psi
    Cylinder 3 -130psi
    I don’t want to get too deep too quick, but thinking maybe poison rings??

    any help would be much appreciated.

    thanks

    i have a video but not able to upload it for some reason

  2. #2
    Click avatar for tech links/info K447's Avatar
    Join Date
    Jul 2007
    Location
    near Toronto, Canada
    Posts
    45,640
    +1
    2,596
    Quote Originally Posted by Burt View Post
    … 255 into a 12 foot aluminum jet boat. Everything was running perfectly until a couple of days ago when it started sounding like a combination between a diesel and a tractor.

    The motor only has 39 hours on it.

    … compression test and cylinder 1 is down.
    Cylinder 1- 80psi
    Cylinder 2 - 120psi
    Cylinder 3 -130psi

    I don’t want to get too deep too quick
    Sounds like the engine is hurt.

    Direct inspection (engine cylinder head removed) of the damaged (low compression) cylinder will show you how much damage. A borescope looking inside through the spark plug hole might give you some clues.

    I will suggest not running or even cranking the engine any further. It seems unlikely to repair itself.


  3. #3

    Join Date
    Oct 2021
    Posts
    4
    Hi,
    Thanks for your reply. I’ll pull the motor and start taking it apart.


  4. #4
    Site Admin Green Hulk's Avatar
    Join Date
    Apr 2005
    Location
    Morgan City, LA
    Posts
    38,348
    +1
    3,296
    Before taking it apart I would highly recommend doing a leak down test. That will tell you if your issue is in the valves not seating properly, or if it's piston/rings.

  5. +1 by:


  6. #5
    This is how I run a jetski shop in the desert nmpeter's Avatar
    Join Date
    May 2008
    Location
    Elephant Butte New Mexico
    Posts
    9,884
    +1
    2,567
    Ya, you never know if a bit of the intercooler broke off and is stuck on a valve seat

    You could also put a teaspoon of motor oil in #1 to see if there is any improvement, which would point to rings being the problem

  7. +1 by:


  8. #6

    Join Date
    Oct 2021
    Posts
    4
    Quote Originally Posted by Green Hulk View Post
    Before taking it apart I would highly recommend doing a leak down test. That will tell you if your issue is in the valves not seating properly, or if it's piston/rings.

    Thanks for the info. I will do a leak down test

  9. #7

    Join Date
    Oct 2021
    Posts
    4
    Thanks to both of you for the info.

    I will do a leak down test and put oil in #1 to see what is going on

  10. #8

    Join Date
    Dec 2018
    Location
    Knoxville, TN
    Posts
    181
    +1
    23
    Let us know what you find.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. FS FS: 2009 Sea Doo RXT IS255 No Trailer
    By Seadoo08 in forum Sea Doo 4Tec Skis
    Replies: 2
    Last Post: 09-02-2016, 06:46 PM
  2. 2009 rxt is255 vs 2010 rxt 260 ?? Big differences?
    By jimmy1173 in forum Sea Doo Open Discussion
    Replies: 1
    Last Post: 07-05-2016, 10:34 PM
  3. Thoughts on used '09 RXT is255
    By ecna in forum 4-Tec Performance
    Replies: 0
    Last Post: 05-18-2014, 05:57 PM
  4. RXT Is255 Needs codes cleared
    By Ken IS255 in forum 4-Tec Performance
    Replies: 11
    Last Post: 01-27-2011, 09:46 PM
  5. RXT is255.... thoughts?
    By Walt2GPinPA in forum 4-Tec Performance
    Replies: 3
    Last Post: 09-07-2009, 07:52 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
  •