i gave my vote to OEM. We run the 127's . They will easily last 2000 kliks if you break it in and follow proper startup procedures. The 067's take 5mph off of top end. I put a dayco 144-4353 on the GADE when i was in cochrane last. It held up well to a 1000 kliks of powder busting
I've just switched back to oem bomb. (067) belt, and it seems to be holding up well and not wearing out too quickly.
For the last few seasons, I used Dayco ultimax II's, the 138-4353 and then the 144-4353. I liked those belts for racing, but they wore out quickly (belt got narrow), and some of them would have cord pull out. I also noticed that when switching from dayco to bomb., I had to either click up tra one or remove 1-1.5g of pin weight to keep rpms.
Does anyone know if Dayco makes the Bombi belts? looking at the markings on the belts, they do look similiar. I would assume though that Ski-doo would have specs as to the tolerances and rubber compounds that they would what the belts made to.
While I stay OEM, I still tinker with belt performance by changing my helix on the driven clutch to a 51 from a 55 for more positive shifting for my riding style. Slow, in deep deep powder through the trees.
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