No but it has some seriously tall gearing. I would be dumping that down to 25/45 or 24/45.

 

I believe that the gearing the in the turbo crossover should be centered around 2 different riding wants / needs. The more off trail oriented crowed with 2" track I would stick to around 23/45 gear ratio, this charges crazy hard 0-60 and 60+ hits hard to over 80 mph but it stops pulling and finishes off around 100 mph. This is in danger O.D speed and pretty fast for a 2" track to be spinning if Ski-Doo put 27/45 gears with that track its mind blowing.

The more trail oriented sleds would want to be in that 1.5" to 1.75" range and in there case I would lean towards 25/45 gear ratio, this would make the sled keep in the torque longer in the 60+ range and likley keep pulling hard right to sign off around 115 mph. Most if not all 850 N/A sleds will struggle to even hit a true 100 mph under most conditions unless its perfect lake running. Having a sled run a bit less gear but be able to shift it right out has always proven to be faster for me in messing around with these machines.

 

I believe that the gearing the in the turbo crossover should be centered around 2 different riding wants / needs. The more off trail oriented crowed with 2" track I would stick to around 23/45 gear ratio, this charges crazy hard 0-60 and 60+ hits hard to over 80 mph but it stops pulling and finishes off around 100 mph. This is in danger O.D speed and pretty fast for a 2" track to be spinning if Ski-Doo put 27/45 gears with that track its mind blowing.

The more trail oriented sleds would want to be in that 1.5" to 1.75" range and in there case I would lean towards 25/45 gear ratio, this would make the sled keep in the torque longer in the 60+ range and likley keep pulling hard right to sign off around 115 mph. Most if not all 850 N/A sleds will struggle to even hit a true 100 mph under most conditions unless its perfect lake running. Having a sled run a bit less gear but be able to shift it right out has always proven to be faster for me in messing around with these machines.

My ‘25 BCXRS 850 NA has 21/45 gears and it definitely needs more gear for high speed running. I plan to go to 23 top gear but not sure if I need to go to a larger chain. I do enjoy the awesome bottom end pull but just need a bit more top end. Sled runs out of gear around 150km/h and goes into over rev

 

My 25 xterrain 850t will run 107 on the speedo, non turbo 850 would run 102, both 2 inch tracks bone stock.

 

23 will fit with your existing chain if it came stock with 21/45

 

I ordered a 26 BCXRS 850 turbo in full trail width with the 1.5 storm. I am switching to the ice arrowhead and will try the stock gearing before I back it down to 25/45