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Pulleys OK?

Discussion in '4 Stroke Turbos/Supercharger' started by YammieDave, Jul 15, 2018.


  1. YammieDave

    YammieDave Newbie

    Messages:
    9
    Location:
    Petoskey, MI
    Country:
    USA
    Snowmobile:
    2008 Nytro RTX 40th Anniversary
    2009 Nytro Supercharged 144"
    Just got my first 4 stroker, and it's supercharged, so thats new to me as well. 2009 Nytro.

    Looking at the lower pulley and it's a bit gritty looking. I wanted to get some advice as to whether I should be concerned about this.[​IMG]
     
  2.  
  3. DGZRT

    DGZRT VIP Member VIP Member

    Messages:
    795
    Location:
    Stevens Point Wisconsin
    Country:
    USA
    Snowmobile:
    2009 Vector LTX, 08 Vector shorty, 98 XTC 500 & 600
    I sell these types of belts and pulleys in Industrial Applications . Something doesn't look right! You could either have the wrong belt and the teeth don't mesh with the pulley correctly or the wrong pulley and the profile is wrong for the belt. I would determine who manufactured the super charger and see if you can find a parts list online . Then try and match up the belt and the pulleys .

    Send the Manufacture the picture and let them take a look.
     
  4. YammieDave

    YammieDave Newbie

    Messages:
    9
    Location:
    Petoskey, MI
    Country:
    USA
    Snowmobile:
    2008 Nytro RTX 40th Anniversary
    2009 Nytro Supercharged 144"
    As a follow-up, I did contact MPI and a tech named Josh replied. He said it did look a little worn, but from what he could tell in the pic the cogs didn't seem to be rounded or stepped.

    He advised that I check the belt tension and the top pulley, and follow up with him if I'm concerned.

    I bought the sled, cleaned and inspected it a little, then put it in my storage 40 minutes away, so I'll get to it this Fall.
     
    MrSled likes this.
  5. MrSled

    MrSled Administrator Staff Member Admin Moderator VIP Member

    Messages:
    17,459
    Location:
    Schofield, WI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder
    It looks loose to me.. have you checked deflection?
     
  6. YammieDave

    YammieDave Newbie

    Messages:
    9
    Location:
    Petoskey, MI
    Country:
    USA
    Snowmobile:
    2008 Nytro RTX 40th Anniversary
    2009 Nytro Supercharged 144"
    Ok, I'll be checking that. It looks like the deflection should be about 1/4" at 15-20 lbs. I'll have to pick up a tensioner tool, Autozone probably has a loaner.
     
  7. MrSled

    MrSled Administrator Staff Member Admin Moderator VIP Member

    Messages:
    17,459
    Location:
    Schofield, WI
    Country:
    USA
    Snowmobile:
    2017 Sidewinder
    I use a fish scale, put metal rule across pulleys and measure. Its pretty stout.
     

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