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Bros Boosted Viper --- Found over heat issue!!

Discussion in 'TY Sled Build' started by MrSled, Apr 17, 2019.


  1. MrSled

    MrSled Administrator Staff Member Admin Moderator VIP Member

    Messages:
    18,193
    Location:
    Schofield, WI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder
    Been fighting an over heat issue on my brothers boosted Viper. I believe it could have been over boosting from day one and in it finally took its toll. You can see the damage on the head and pistons.

    57636784121__136F9340-7ACC-4071-B300-7F857C19C4DB.JPG 57636788045__B9BE0E4C-D885-4AE1-8C6E-A2C35E230E56.JPG 57636804708__E8D2F74D-2F2C-4FB7-9BA7-07B2BD71401C.JPG 57636806506__4BEEB843-E1BD-41B3-990A-E3E9CDB1A848.JPG IMG_1996.JPG IMG_1997.jpg IMG_1998.jpg

    Above you can see where the head gasket failed

    Randy (10).jpg Randy (11).jpg
     
    yamahaguy likes this.
  2.  
  3. MrSled

    MrSled Administrator Staff Member Admin Moderator VIP Member

    Messages:
    18,193
    Location:
    Schofield, WI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder
    Here are a few more images of pulling the motor and pulling the motor apart. We are going to crank up the boost to 8 to 12 lbs like my other Viper, with bigger injectors, PCV as well as a thick head gasket.

    Randy (1).JPEG Randy (2).JPEG Randy (3).JPEG Randy (4).JPEG Randy (5).JPEG Randy (6).JPEG Randy (7).JPEG Randy (8).JPEG Randy (9).JPEG Randy (10).JPEG Randy (11).JPEG Randy (12).JPEG Randy (13).JPEG Randy (14).JPEG Randy (15).JPEG Randy (16).JPEG
     
    Pstn head and yamahaguy like this.
  4. MrSled

    MrSled Administrator Staff Member Admin Moderator VIP Member

    Messages:
    18,193
    Location:
    Schofield, WI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder
  5. yamahaguy

    yamahaguy aka "Soft Core" Lifetime VIP Member VIP Member

    Messages:
    1,330
    Location:
    Elmira, MI (center of the snow belt)
    Country:
    USA
    Snowmobile:
    2015 Yamaha MTX LE with MPI
    You have been busy guy! I'm sure you were happy to finally find the problem. So was this a stock MPI kit with eabc ?
     
  6. MrSled

    MrSled Administrator Staff Member Admin Moderator VIP Member

    Messages:
    18,193
    Location:
    Schofield, WI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder
    My snowmobile shop always has fun projects going. Me and Steph still went and rode one last time last weekend too :D

    Anyway, yes it had a EABC on it but didnt when we originally purchased it. Had to convert it over and I think maybe it was pushed at sea level before it could be dialed back.
     
  7. yamahaguy

    yamahaguy aka "Soft Core" Lifetime VIP Member VIP Member

    Messages:
    1,330
    Location:
    Elmira, MI (center of the snow belt)
    Country:
    USA
    Snowmobile:
    2015 Yamaha MTX LE with MPI
    Do you have the EABC with the dot sticker that indicates that has the correct software?
    Some of those were flashed with the wrong software causing overboost. hopefully you don't have one of those . Look for the dot on the black plastic module which will indicate MPI has checked it for the correct software flash. You probably had gauges on that one anyways im guessing.
     
  8. MrSled

    MrSled Administrator Staff Member Admin Moderator VIP Member

    Messages:
    18,193
    Location:
    Schofield, WI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder
    Yes we were aware and had the correct EABC but as I mentioned I think it was roached before we put the EABC kit on it.
     
  9. maim

    maim Moderator Staff Member Moderator Lifetime VIP Member VIP Member

    Messages:
    4,785
    Location:
    sudbury on
    Country:
    Canada
    Snowmobile:
    2016 apex xtx/ 2011 apex xtx/ 2009 phaser rtx/x/ 1997 et410t/r
    glad to see you found the problem. odds are with all the good stuff you are doing to it, it will keep him happy and suprise a few others guys.
     
    74Nitro and MrSled like this.
  10. MrSled

    MrSled Administrator Staff Member Admin Moderator VIP Member

    Messages:
    18,193
    Location:
    Schofield, WI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder

    Oh ya she will rip now.
     
  11. yamadoo

    yamadoo Yamadoo is a snowmobile ' aholic'. Lifetime VIP Member VIP Member

    Messages:
    3,050
    Location:
    SE MN work North shore Superior play
    Country:
    USA
    Snowmobile:
    15 Viper STX DX red/white
    13 Apex XTX 45 anniversary RED/WHITE/BLACK
    10 Vector LTX Blue
    11 Venture Gt
    86 SnoScoot(2) for grand kids
    Tom and all you guys amaze me...... good job!
     
    MrSled likes this.
  12. MrSled

    MrSled Administrator Staff Member Admin Moderator VIP Member

    Messages:
    18,193
    Location:
    Schofield, WI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder
    It’s just a motor. Lol and there sure is a lot of crap to move to get it out :D
     
    Last edited: Apr 18, 2019
  13. 74Nitro

    74Nitro TY 4 Stroke Master

    Messages:
    1,310
    Location:
    Dublin Ontario
    Country:
    Canada
    Snowmobile:
    2019 Sidewinder LTX
    Good work guys and thanks for sharing.
    Glad I have knock protection!
     
    MrSled likes this.
  14. ClutchMaster

    ClutchMaster Classic Member VIP Member

    Messages:
    1,539
    Location:
    tomahawk
    Country:
    USA
    Snowmobile:
    2015 Viper 270 hurricane,
    2002 Viper W/162 A.C. skid, SRX pipes &CDI, 780 BB
    Wow hard to believe the bearings look so good!
    That’s one tough motor 4 sure.
    I really like how your doing all your own repair work, commendable.
     
    MrSled likes this.
  15. Big_Phil

    Big_Phil TY 4 Stroke Guru

    Messages:
    872
    Location:
    Wasaga Beach, Ontario
    Country:
    Canada
    Snowmobile:
    Sidewinder RTX LE
    Forget the shim, put some low compression pistons in since you are replacing them anyways. It must have been turned up past 8psi to do damage like that, or someone ran with shitty fuel and held it to the bar for a long time.
     
    MrSled and 74Nitro like this.
  16. MrSled

    MrSled Administrator Staff Member Admin Moderator VIP Member

    Messages:
    18,193
    Location:
    Schofield, WI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder
    Thank you!!

    Brother already had the time and money into machining and wanted to keep the cost low, so this is the route we take. If it was me I would have tapped the throttle and launched it off a cliff..LOL
     

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