There is no comapny that makes the "best belt" All have companys their high proformance belt. Personnally i like the ultimax XS. It was a real strong long lasting belt for the price. I am running a dayco XTX now. Still a good belt but again personnaly i would go back to the XS. Bomby, cat and polaris all make betls, ive never used cat or polaris belts but i know bombardiers belt are WAAAAAAAAAAAY over priced and i would never buy one.
I had to ajust my clutch for my dayco belt. Your ajusting your secondairy to fit the belt better so it sits in there perfect. Sometimes its to tight which will make the sled roll a bit at idle. Or if its too loose it might not engage properly. Finding the correct ajustment for your belt will enhance your belts life and performance.
i've used polaris oem's on mine. lasted three to four years now. had the ultimax 3 on there too for long. pretty tough. i tow a 'sled' with meat, pack ice with it, also tow other snowmachines if i have to. had no problems.
im using a polaris Kevlar belt i purchased this year, have over 1500 miles on it, and yet no problem at all... check to see if you maybe can find a Kevlar belt for your sled? you do pay more upfront but imo its worth it....
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