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2021 Thundercat blowing belts

Discussion in 'SideWinder Trail Talk' started by Slow998, Feb 23, 2021 at 12:52 PM.


  1. Slow998

    Slow998 Newbie

    Messages:
    15
    Location:
    Maine
    Country:
    USA
    Snowmobile:
    2021 Thundercat
    LOCATION:
    Maine
    I have a 21 Thundercat with TD jukebox and usually run around 280-300 horse tune most of the time. Last time out I blew 3 belts in 30 miles. Right now it has 73 gram Dalton weights loaded to 78 grams, stock primary spring, Ron Ward torsion conversion in the secondary, XS829 or 827 Ultimax belts, 21/37 gear and 1" ripsaw studded track. Snow conditions have been loose, but would 21/37 gear make it that hard belts?!?
     
    rlbock likes this.
  2.  

  3. Tcat100

    Tcat100 VIP Member VIP Member

    Messages:
    122
    Location:
    Chicago
    Country:
    USA
    Snowmobile:
    ZR9000
    Oh ya! you can gear up a bit from stock, but not that much (if you expect good belt life)
     
    Last edited: Feb 23, 2021 at 1:10 PM
  4. Slow998

    Slow998 Newbie

    Messages:
    15
    Location:
    Maine
    Country:
    USA
    Snowmobile:
    2021 Thundercat
    LOCATION:
    Maine
    I should add that our trails are like super highways. Its nothing to cruise at 80-100 mph and squeeze it into the 130 range.
     
  5. Tcat100

    Tcat100 VIP Member VIP Member

    Messages:
    122
    Location:
    Chicago
    Country:
    USA
    Snowmobile:
    ZR9000
    I ride the UP of Michigan, mostly RR grades
     
  6. Slow998

    Slow998 Newbie

    Messages:
    15
    Location:
    Maine
    Country:
    USA
    Snowmobile:
    2021 Thundercat
    LOCATION:
    Maine
    K, thanks. I have a sled trip planned but don't want to blow belts the whole trip.
     
  7. TPAY243

    TPAY243 Lifetime Member Lifetime VIP Member VIP Member

    Messages:
    738
    Location:
    Northern Wis
    Country:
    USA
    Snowmobile:
    2020 Yamaha Sidewinder LTX SE
    I'd pull the clutch off and make sure stub shaft hasn't moved.
     
    jonlafon1 likes this.
  8. Slow998

    Slow998 Newbie

    Messages:
    15
    Location:
    Maine
    Country:
    USA
    Snowmobile:
    2021 Thundercat
    LOCATION:
    Maine
    I did, and checked clutch alignment. It's spot on. I've put about 600-700 miles on my sled with it geared this way and haven't had an issue until now but the trails have been fairly firm until last weeks snow. I'm having a hard time believing that gearing is causing my issue but I haven't found anything else. I have about 1,300 miles on the sled
     
  9. jonlafon1

    jonlafon1 Lifetime Member Lifetime VIP Member VIP Member

    Messages:
    1,986
    Location:
    Mount Morris, WI. Wakefield, MI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder LTX-SE. 2021 Cat 8000
    Any chance you have springs binding? I’m not familiar with the Team on the thunders. But any spring binding at all with this power will eat them belts.
     
  10. jonlafon1

    jonlafon1 Lifetime Member Lifetime VIP Member VIP Member

    Messages:
    1,986
    Location:
    Mount Morris, WI. Wakefield, MI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder LTX-SE. 2021 Cat 8000
    Temp check those clutches with your hands also. Betting one OR both of them is running HOT
     
  11. Slow998

    Slow998 Newbie

    Messages:
    15
    Location:
    Maine
    Country:
    USA
    Snowmobile:
    2021 Thundercat
    LOCATION:
    Maine
    Just by touch, the belt feels the hottest, the secondary is also very hot and the primary feels the coolest
     
  12. jonlafon1

    jonlafon1 Lifetime Member Lifetime VIP Member VIP Member

    Messages:
    1,986
    Location:
    Mount Morris, WI. Wakefield, MI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder LTX-SE. 2021 Cat 8000
    You got a torsion secondary? Try wrapping the spring tighter. You should be able to hold hands anywhere on either clutch. Sounds like your not balanced so to speak. Primary is pulling belt through secondary?
     
    Sorcerer likes this.
  13. Slow998

    Slow998 Newbie

    Messages:
    15
    Location:
    Maine
    Country:
    USA
    Snowmobile:
    2021 Thundercat
    LOCATION:
    Maine
    Yes, it's a torsion conversion in the stock secondary clutch. I'll try the next tighter hole and see what happens
     
  14. jonlafon1

    jonlafon1 Lifetime Member Lifetime VIP Member VIP Member

    Messages:
    1,986
    Location:
    Mount Morris, WI. Wakefield, MI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder LTX-SE. 2021 Cat 8000
    ;)!
     
    Sorcerer likes this.
  15. DooZ

    DooZ Expert

    Messages:
    385
    Location:
    Minocqua, WI
    Country:
    USA
    Snowmobile:
    '17 ZR9000RR, Doo 1200
    Call Ron Ward and ask him his thoughts on your secondary. From everything I've heard he's a good guy and will try to help you troubleshoot.
     
  16. 0degC

    0degC Extreme

    Messages:
    69
    geared on the high side but don't think that is your problem. and even if alignment was off a bit 3 belts in 30 miles is crazy so must be something else going on. I would have a good look at your clutches, take off sled and take apart if needed something is up.
     

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