Page 1 of 3 1 2 3 LastLast
Results 1 to 10 of 22
  1. #1
    Thiger's Avatar
    Join Date
    Sep 2009
    Location
    Sweden
    Posts
    27

    Stx-r domes size?

    I have bought a stx-r with a engine breakdown, because they have run it on pumpgas with to much compression (36cc domes).
    I dont wanna do same misstake.

    Srx-r 1200 setup:

    Novi 48 with tauceti
    M16 reed valve & intake manifold with spacer
    no cylinder porting
    miller head dome size?
    factory triple pipes with cdi
    R&D intake & ride plate
    Skat trak pump 12 vanes

    question 1, what dome size can i use with pumpgas 99okt?

    question 2, is it possible to run a 50/50 mix on e85 and 99 okt to use a smaler domesize?


  2. #2
    jonny5's Avatar
    Join Date
    Aug 2005
    Location
    Redding, CA
    Posts
    1,266
    +1
    5
    It seems you have bought someones limited ski.

    If it has miller heads it may also have flattop pistons. May want to check before you think of another head.

    I dont think miller has domes any more for the MSE heads for the stxr. If he does probably only race gas heads and flat top ones.

    You need about 140 psi or less for a 50/50 mix and about 120-130 psi for 92 octane.

    You have to run higher octane because of the pipes and cdi. You may want to check to see if the cdi is on the race curve. Which is a little white plug that is on the right side about where your knee would be if you where sitting on the ski but inside.

    If the white plug is in then it's in the race gas curve and needs to be taking off and just put in a bag for safe keeping.

    Best thing to do is get stocks heads and put them on and go. Cheapest and easiest way. Check to see if you have flat top pistons before you do anything with the head

  3. #3
    btldigger's Avatar
    Join Date
    Feb 2007
    Location
    lebanon tn.
    Posts
    1,641
    Im with johnny on this one, sounds like you bought a race boat.

    With the pipes you need stock heads to run pump gas. I think they are about 46cc. If it has flat tops in it then that will change what heads it needs. Also check under the cylinders for spacers, just in case it happens to be a raised port setup.

    Post some pics of what you got that would help us steer you in the right direction.

  4. #4
    Thiger's Avatar
    Join Date
    Sep 2009
    Location
    Sweden
    Posts
    27
    The damaged piston is a wsm, not a flat topp, maybe it was wrong pistons for the cylinderhead? However i will get new piston and bore it upp one size (it is not nicasil). Do you think it will add to much heat to the piston with the triple pipes when it not nicasil?

    I thinki will get a ada cylinderhead and 44cc domes and mix 50/50 99okt/e85. I know i must rejet the carburators for about 15% more fuel, but how du you kalkylate what jetsize it will be?

    Thanks for tips/ideas..

  5. #5
    jonny5's Avatar
    Join Date
    Aug 2005
    Location
    Redding, CA
    Posts
    1,266
    +1
    5
    If any jet change is required it will probably be small.. Like a 145 to a 142.5 or the other way. I would go leaner if it was me but thats me..

    I would go stock heads way cheap.....and if ya want to run race fuel put the other heads on.

  6. #6
    Thiger's Avatar
    Join Date
    Sep 2009
    Location
    Sweden
    Posts
    27

    Foto of cylinderhead

    Is it a flattop dome?
    Quote Originally Posted by Thiger View Post
    I have bought a stx-r with a engine breakdown, because they have run it on pumpgas with to much compression (36cc domes).
    I dont wanna do same misstake.

    Srx-r 1200 setup:

    Novi 48 with tauceti
    M16 reed valve & intake manifold with spacer
    no cylinder porting
    miller head dome size?
    factory triple pipes with cdi
    R&D intake & ride plate
    Skat trak pump 12 vanes

    question 1, what dome size can i use with pumpgas 99okt?

    question 2, is it possible to run a 50/50 mix on e85 and 99 okt to use a smaler domesize?
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	div 034.jpg 
Views:	54 
Size:	734.4 KB 
ID:	169083   Click image for larger version. 

Name:	div 029.jpg 
Views:	47 
Size:	731.0 KB 
ID:	169084  

  7. #7
    jonny5's Avatar
    Join Date
    Aug 2005
    Location
    Redding, CA
    Posts
    1,266
    +1
    5
    Little hard to tell try another pic of the dome at more of a angle. Looks like flatop but not a 100%...

    Sorry

  8. #8
    Thiger's Avatar
    Join Date
    Sep 2009
    Location
    Sweden
    Posts
    27

    more pictures

    domes
    Quote Originally Posted by jonny5 View Post
    Little hard to tell try another pic of the dome at more of a angle. Looks like flatop but not a 100%...

    Sorry
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	div 028.jpg 
Views:	51 
Size:	732.0 KB 
ID:	169085   Click image for larger version. 

Name:	div 030.jpg 
Views:	46 
Size:	732.4 KB 
ID:	169086   Click image for larger version. 

Name:	div 031.jpg 
Views:	47 
Size:	740.4 KB 
ID:	169087  

  9. #9
    Thiger's Avatar
    Join Date
    Sep 2009
    Location
    Sweden
    Posts
    27

    race boat yes!!

    It is an old race boat and it will be this season to. But the last owner had no knownedge obout how a engine works. He just filld it with pumpgas and go for a ride. Later that day he sink it to bottom of a river. Then i bought it. So i have a lot to do with this boat. Must check evrything, jetting, cdi, domes...etc..
    It gonna be some threads in this forum...he he
    Quote Originally Posted by Thiger View Post
    domes

  10. #10
    jonny5's Avatar
    Join Date
    Aug 2005
    Location
    Redding, CA
    Posts
    1,266
    +1
    5
    yes that is for flat top pistons. Which means thats more than likely all your gonna get.

    When you figure out what your gonna do wih the ski like race it or rec ride it let us know and we can help get you lined out for pistons or compression and what ever else.

    K till then

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. ADA Dome size
    By TBone14 in forum Polaris Open Discussion
    Replies: 7
    Last Post: 12-17-2012, 07:49 PM
  2. what is the stock dome size of an octane?
    By ktmracer153 in forum Polaris PWC Performance
    Replies: 0
    Last Post: 07-15-2012, 10:26 PM
  3. 03 STX-r Tank size/Fuel Gage
    By ekm in forum Kawasaki Open Discussion
    Replies: 1
    Last Post: 07-01-2009, 11:49 PM
  4. whts best dome size 2 use w/ fp wet pipe?
    By born riding in forum Kawasaki PWC Performance (2-stroke)
    Replies: 3
    Last Post: 01-23-2008, 11:30 AM
  5. How much compression/what dome size for 66e on pump gas.
    By WaveDemon in forum Yamaha PWC Performance (2-stroke)
    Replies: 19
    Last Post: 12-14-2007, 05:53 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
  •