Page 1 of 3 1 2 3 LastLast
Results 1 to 10 of 23
  1. #1

    Join Date
    May 2014
    Location
    Hervey Bay Queensland Australia
    Posts
    17
    +1
    4

    STX-12F 2003 : Poor cooling system design

    My ski has always been used in salt water only and always flushed well after use. Engine overheating recently & noted 2 holes in exhaust pipe under rubber coupling where it joins to LH muffler. Removed all the exhaust system and noted internals of exhaust pipe completely corroded, end of exhaust pipe frozen into muffler housing, 2 rings almost invisible from corrosion and front alloy muffler housing 1/2 missing from corrosion.

    It seems to me that from the design of the ski, (salt) water will ALWAYS sit inside the alloy exhaust pipe after riding, as this is the lowest point, and there is no where for it to exit to - until the ski runs again. When the ski is flushed with a hose, water enters the head up high and then exits straight out the back without flushing the lower end of the exhaust pipe.

    To solve this problem, I have installed a 2nd flushing point on my ski - I have 2 "tow taps" installed in the 2 hoses that come from the external water pickup. These 2 hoses are temporarily removed from the tow taps and are joined with a "y" joiner piece which can be connected to a garden hose. This way fresh water enters the ski from where it would normally enter, and at this position the exhaust system gets a full flush.


    Any comments ?
    Last edited by Beancounter; 05-10-2014 at 09:04 AM.


  2. #2
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    Location
    Houston
    Posts
    4,485
    +1
    320
    Pictures would help, I doubt it will extend the life of the pipe that much but who knows. I have 260 Hours on my 12f and the pipe is fine.

    Sean

  3. #3
    Take the time to smile sirbreaksalot's Avatar
    Join Date
    Jun 2007
    Location
    Brisvegas
    Posts
    4,157
    +1
    598
    flushing CORRECTLY is the key to longevity ......

    99% of corrosion can be avoided with good care


  4. #4

    Join Date
    May 2014
    Location
    Hervey Bay Queensland Australia
    Posts
    17
    +1
    4
    Click image for larger version. 

Name:	IMG_0010.jpg 
Views:	147 
Size:	73.8 KB 
ID:	329286The problem....after 70 hours use.

  5. #5

    Join Date
    May 2014
    Location
    Hervey Bay Queensland Australia
    Posts
    17
    +1
    4
    Click image for larger version. 

Name:	IMG_0016.jpg 
Views:	124 
Size:	73.8 KB 
ID:	329287Maybe the solution .....

  6. #6
    Take the time to smile sirbreaksalot's Avatar
    Join Date
    Jun 2007
    Location
    Brisvegas
    Posts
    4,157
    +1
    598
    mmmmmmmmmm
    this will work better than re-designing something that has proven to last HUNDREDS of hrs for years before your ski had a issue.!!!
    Attached Images Attached Images  

  7. #7
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    Location
    Houston
    Posts
    4,485
    +1
    320
    I just squirt a shit load of dish soap into the flush port, when the ski quits farting bubbles you know all the soap is out.

    Sean

  8. #8
    flush for longer, I flush for nearly 5 minutes

  9. #9

    Join Date
    May 2008
    Location
    Sweetwater
    Posts
    887
    +1
    139
    I have always used salt away, and still do out of habit...However, I am not convinced it does anything vs a good fresh water flushing. I have had my 12F engine apart a few times and there is still a good amount of corrosion the cooling ports, sometimes that corrosion is dyed blue. LOL

    Regardless, I still use it as it's cheap insurance, and I like the bubbles..

    I had the same issue with my 12F, the end wasn't that bad but pretty close. Also, I can 100% guarantee the water intake manifold on the starboard side of the motor under the intake is corroded beyond belief. It was a well known design flaw, however the new design is way better and easy to install. Good luck..

  10. #10

    Join Date
    May 2014
    Location
    Hervey Bay Queensland Australia
    Posts
    17
    +1
    4
    Ok... it looks like I need to improve my flushing routine. It may have been covered in a thread/s previously or separately, but can I get some collective suggestions on the best flushing routine/s for a Kawasaki 12F.
    e.g. Is it safe or recommended to flush all the motor and all the electrics, or are there some parts to keep clear of ?

    P.S. The water pipe under the intake manifold was replaced 18 months ago and still looks "as new".

  11. +1 by:


Page 1 of 3 1 2 3 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Replies: 0
    Last Post: 06-17-2016, 11:48 AM
  2. STX 12F 2003 Battery warning and battery draining and display problem
    By Leep in forum Kawasaki PWC Performance (4-stroke)
    Replies: 0
    Last Post: 06-17-2016, 11:48 AM
  3. FS 2003 kawasaki stx-12f...cheap
    By T-DUB in forum Kawasaki Skis
    Replies: 0
    Last Post: 07-05-2011, 07:30 PM
  4. 2003 Kawasaki STX 12F Won't Idle
    By P47 in forum Kawasaki Open Discussion
    Replies: 0
    Last Post: 06-04-2008, 08:09 AM
  5. 2003 stx 1100 di vs 2003 stx 12F
    By happyappy in forum Kawasaki Open Discussion
    Replies: 0
    Last Post: 06-13-2007, 03:02 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
  •