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From my calculations and studies, New QD2 50:22 Pulley ratio 2.7272 with 6 tooth drive axle, on to 2.47:1 Final Drive ratio as per Polaris 2018 AXYS 2.86 pitch 7 tooth Series 6 Stock 42:22 Pulley ratio on to 2.223:1 final drive ratio (my calculation)
2018 AXYS 2.86 pitch 7 tooth Series 6 PRO 44:21 Pulley ratio On to 2.383:1 final drive ratio (my calculation)
If I do some quick calculations with PRO top 50:21 Pulley ratio On to 2.5876:1 final drive ratio (my calculation) this is assuming that you can get a belt to use in this application.
This would be a great final drive ratio for high altitude riding IMHO with the Series 8 - 2.75" track! If some aftermarket manufacturer would come hp with a bolt on QD belt tensioner the problem would solve itself. I don't know it the TKI belt tensioner for the QD to TKI belt conversion would work to tension the QD2 belt with the PRO 21t top pulley.
Just some Self Quarantine thoughts from a Sunday afternoon in Laramie WY.
If you look at what TKI and Kurts both do , they both use a tensioner with no problems and so that is why I posed this possible approach and you would only be one tooth less in total tooth count so I would think the "backbend " would be very slight. I may still take the step next year and try a 50 t bottom pulley with a QD2 belt which I think is 72 tooth and talk with the folks at TKI first. Could be an inexpensive approach to gearing these sleds down using Poo parts that we already have in hand. Just thinking around the edge of the box!
I for one would hate to have to go back to the days of packing gas to ride more than 50 miles, just due to the Qd2 , ( Like many of my Doo friends have to ) we will typically ride cross country 50 to 70 miles each time we go, one of our group use to ride a 800 pro with the 3" chain drive he would usually need to bring gas, wondering if the new Qd2 gear ratio would be the same ?
Not 50 to 60 MPH but 50 to 70 total miles in distance .Why? Would you plan on riding at above 50 or 60 miles per hour where low gearing might actually start to produce higher RPM's? The cvt clutch is designed to cruise at near the same RPM regardless of gearing. If it doesn't you don't have it clutched properly.
Not 50 to 60 MPH but 50 to 70 total miles in distance .
Oh , I see what you are saying , I was just comparing it to the 3 " chain drive 800 Pro my friend use to have and he did not get anywhere close to what the rest of could get , and would have to pack gas for the longer rides. I think his was around a 12% reduction, so with 10 % reduction of the Qd2 was just wondering if it would be the same , Guess time will tell .I get that but my point is fuel economy won't change if your belt is running 1/2 way up your primary or 3/4 of the way up the primary. That is all gearing should do at a steady speed, to a point of maxing out.
Oh , I see what you are saying , I was just comparing it to the 3 " chain drive 800 Pro my friend use to have and he did not get anywhere close to what the rest of could get , and would have to pack gas for the longer rides. I think his was around a 12% reduction, so with 10 % reduction of the Qd2 was just wondering if it would be the same , Guess time will tell .