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Alright i picked up a pretty sweet indy sport and it runs and drives great. i dont have a title and im not good with numbers. Serial number was 2400932 and engine number was 9500914. Im gonna need to buy a track but im not sure if its a 121 or the 133.5 its a indy sport and i think touring im not sure thats why i need help. If you can provide an engine size/track size etc pls comment
 

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Should be another number on the tunnel as well. That has a date on it. If you can post a picture that will help.
 

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On the tunnel is should say a date and then below or next to it a serial number. But the date will help and so will a picture of the snowmobile.
 

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If your tunnel stops at the end of the seat it's a 121. If the tunnel has an extension riveted onto the tunnel and extends beyond the seat it's more than likely a 133.5" track. The most accurate way to determine the track length is the count the small drive nubs around the inside of the track and multiply by 2.52. Make a mark on one of the outside ones to know when you get all the way around and count away.
 
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