Page 1 of 2 1 2 LastLast
Results 1 to 10 of 11

Thread: 12F upgrades?

  1. #1
    Mike's GPR's Avatar
    Join Date
    Mar 2008
    Location
    Carol Stream, IL
    Posts
    2,044
    +1
    20

    12F upgrades?

    I'm a Yamaha guy and my friend has a Kawasaki 12F, I believe 2007.

    He is looking for some cheap, yet effective upgrades to do. I know the Yami GP1300R inside and out, but no very little about the 12F.

    He is looking for harder acceleration and improvements for rough water hook up, wave jumping, etc.


  2. #2
    jonny5's Avatar
    Join Date
    Aug 2005
    Location
    Redding, CA
    Posts
    1,266
    +1
    5
    Worx grate for hook up....a swirl prop would be good for improved bottom and mid and a poosible top end gain but would probably stay the same.

    A air intake kit ....and a plate for more top end.....but thats about it.

    There is also a solas prop too which should be a good all around prop.

  3. #3
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    Location
    Houston
    Posts
    4,485
    +1
    320
    You could run the same set up that I do, intake, and exhaust, and then do the grate, the prop and the plate... The intake I built out of auto zone parts, 4 inch spectre filter 3 inch 90 degree elbow and a 3 inch silicone connector. The Exhaust I made out of a 2.5 inch of aluminum inter cooler tubing from supra sport. com I have pictures in my photo gallery. If you are looking for top speed then run a cut stock intake grate, you cut the center bar out and thin the others down. If you are handy with tools you could advance the timing like I did but I don't know for sure if it helped any, I don't have actual numbers yet.

    Sean
    Last edited by smokeysevin; 01-20-2009 at 07:30 PM. Reason: Added the last two lines.

  4. #4
    jonny5's Avatar
    Join Date
    Aug 2005
    Location
    Redding, CA
    Posts
    1,266
    +1
    5
    is your GPS speed of 54 with your mods...??

  5. #5
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    Location
    Houston
    Posts
    4,485
    +1
    320
    yeah, with another rider and 3/4 tank of gas in 47 degree weather. that was taken before the timing advance and I am now turning 2 more small bars over 7k

    Sean

  6. #6
    Mike's GPR's Avatar
    Join Date
    Mar 2008
    Location
    Carol Stream, IL
    Posts
    2,044
    +1
    20
    Thanks for the input. I will let my friend know.

  7. #7
    Mike's GPR's Avatar
    Join Date
    Mar 2008
    Location
    Carol Stream, IL
    Posts
    2,044
    +1
    20
    Quote Originally Posted by jonny5 View Post
    is your GPS speed of 54 with your mods...??
    54 is about the stock top speed on the 12F.

    My friend always gets upset cause I always cruise past him. But I am not comparing apples to apples here. I have a modded GP1300R with a GPS top speed of 70+ mph.

  8. #8
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    Location
    Houston
    Posts
    4,485
    +1
    320
    Yeah, the 12f is my first ski so its been really nice and reliable, its got 150 hours on it and I'm pretty sure the impeller needs to be replaced, it has seen better days. But, for what it is and what I use it for (towing and cruising) it's a dam# good ski... not the fastest by any standards but just a great all around ski...

    Sean

  9. #9
    vtec
    Join Date
    Mar 2009
    Location
    west chicago burbs
    Posts
    1

    Talking stx12f v gp1300r...

    hey thanx Mike for throwing that out there 4 me. i just signed onto this 03-02, its pretty cool in here. i c ur a "wise guy" aye, w/the urs is faster than mine bit. but, ill b the 1st to admit fact, you FLY past me. it was pretty cool topping urs out on the river this past end o summer. by the time i get back from Peru, its gonna be spring!!! cant wait buddy, hopefully ill b able to do what i gotsta to get a lil more bottom end out of mine b4 we hit the lake again. so now its my turn, ur ski is faster, but not ur car!!!

  10. #10
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    Location
    Houston
    Posts
    4,485
    +1
    320
    The interesting thing about the 12f is it has a higher compression ratio than the 15f and the same block, it just has a different crank, intake and throttle body assembly, so theoretically you could swap those things over and have a really high compression ratio stroker 12f but you would need dished pistons if you want to run pump gas because the comp ratio would be something stupid like 13 to 1

    Sean

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 15F/12F Jetpump Bearing Upgrade to 2012 Spec
    By meangreenman in forum Kawasaki Tech Tips and Info
    Replies: 43
    Last Post: 04-24-2017, 02:07 PM
  2. WTB - Parts WTB: Kawasaki 12F / 15F upgrade parts
    By TCNJ in forum Kawasaki Classifieds
    Replies: 4
    Last Post: 08-16-2016, 09:41 PM
  3. STX-12F with a few minor upgrades
    By joezek in forum Kawasaki Projects
    Replies: 18
    Last Post: 03-09-2013, 01:16 PM
  4. Upgrade Question about stx 12F
    By smokeysevin in forum Kawasaki PWC Performance (4-stroke)
    Replies: 2
    Last Post: 06-23-2009, 10:36 PM
  5. Battery upgrade
    By Kinchyle in forum 4-Tec Performance
    Replies: 8
    Last Post: 10-04-2005, 06:26 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
  •