Page 1 of 2 1 2 LastLast
Results 1 to 10 of 16
  1. #1

    Join Date
    Aug 2009
    Location
    McKinney, TX
    Posts
    124
    +1
    1

    Repairable 4tec or complete rebuild?updte- Are these welded cases good?

    So, I Installed a SBT motor that was originally built in 2009 and sat unused in its box until a few weeks ago. Installed it and it started up fine but with white smoke and smell of coolant. Tightened the head and it quit until the lake test and started smoking again. Thought maybe the head gasket let go so I pulled the head and found a cracked cylinder. Is this a total loss? I have never rebuilt a 4 stroke but have done quite a few 2smokes. Looking for some opinions on what to do here. I do still have the 2005 core motor that injested water that turns over but sat for some time. Any inputs would be great on how to resolve this mess..

    Click image for larger version. 

Name:	photo 1.jpg 
Views:	232 
Size:	86.1 KB 
ID:	328467Click image for larger version. 

Name:	photo 3.jpg 
Views:	154 
Size:	75.2 KB 
ID:	328468Click image for larger version. 

Name:	photo 5.jpg 
Views:	141 
Size:	63.7 KB 
ID:	328469
    Last edited by richte18; 05-15-2014 at 07:54 AM.


  2. #2
    Pwgsx's Avatar
    Join Date
    Sep 2006
    Location
    DFW- TX
    Posts
    1,196
    +1
    38
    Another wonderful SBT engine!!

  3. #3
    dsteinmann's Avatar
    Join Date
    Apr 2012
    Location
    St Louis
    Posts
    278
    +1
    8
    So did you just get, Can you return it? Or did you buy it over a year plus ago and now have no warranty, since you let it sit in the box

  4. #4
    I hate to say it but it sat too long to get warranty relief but I suggest trying. Can a machine shop weld up the crack and bore or hone the jug? Looks like a lot of pitting on thee cylinder skirts too.

  5. #5
    Banned User
    Join Date
    Dec 2006
    Location
    Crest Hill, IL
    Posts
    9,512
    +1
    215
    Sleeves are pitted...
    Block is cracked...
    Pistons are oversized...

    If you reuse the 05 block, its gonna need to be cleaned up...and you will need to reuse the original pistons...New bolts, bearings, etc...Lots of work to swap parts over...

    Unless you can trade the old core, and this unit, for a whole complete unit from SBT....

    This time, put the thing in right away....

  6. #6
    Moderator Snoman's Avatar
    Join Date
    Apr 2006
    Location
    South Chicagoland
    Posts
    14,688
    +1
    846
    Do it right,otherwiswe you will be right back here doing this again..Dont shortcut anything on the new rebuild...IF your going to mix and match parts you better be 110% right that they can be mixed and will work together....Do your research befroe jumping in feet first....And Yes,stay away from SBT....

  7. +1 by:


  8. #7
    i don't know much about the SBT guys but a read a lot of problems about their rebuilts!!!!!!

  9. +1 by:


  10. #8
    Seakid's Avatar
    Join Date
    Jun 2012
    Location
    East Texas
    Posts
    442
    +1
    9
    Yeah heard so much about sbt. I has sbt engine in my kawasaki and lasted me 4 half years before I sold it it gave me no problems. I guess I was one of lucky few? Idk

  11. #9

    Join Date
    Mar 2006
    Posts
    1,833
    +1
    119
    I do not see an oil jet in the block. If that is correct, you need another 06+ block, bore and finish hone to the .5 mm over pistons and trans plant everything from that motor into the new block.

    I have 1 perfect for your project. PM me if you are interested.

  12. #10
    dsteinmann's Avatar
    Join Date
    Apr 2012
    Location
    St Louis
    Posts
    278
    +1
    8
    Quote Originally Posted by jim View Post
    I do not see an oil jet in the block. If that is correct, you need another 06+ block, bore and finish hone to the .5 mm over pistons and trans plant everything from that motor into the new block.

    I have 1 perfect for your project. PM me if you are interested.
    OR you could use a 05 or older block pull the Oil valve out on the top and drill a 1/2 Hole in the front PTO / counter balance area. And Bolt that 06+ head on a Older block. Make sure you set the crank up for the right head also

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. Seadoo 787 top end or complete rebuild ?
    By arctic388 in forum Sea Doo Open Discussion
    Replies: 4
    Last Post: 05-20-2016, 04:26 PM
  2. Are these bearing any good for the Superchargers
    By JeffStalone in forum Sea Doo Open Discussion
    Replies: 6
    Last Post: 03-23-2016, 11:34 AM
  3. 1995 Polaris SLT 750 are these OEM pistons or not?
    By jajardas in forum Polaris Open Discussion
    Replies: 4
    Last Post: 06-20-2014, 02:26 PM
  4. Are these 951 cases okay to use?
    By richte18 in forum 2-Stroke Performance
    Replies: 5
    Last Post: 07-22-2013, 09:56 PM
  5. 4tec Crank repair lunati or falicon or other
    By dhoad in forum 4-Tec Performance
    Replies: 24
    Last Post: 08-07-2009, 04:37 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •