HOT ROD SLED SHOP GEAR & CHAIN KIT FOR SKI-DOO 900 ACE TURBO 2021-2023 (FOR SLEDS WITH STOCK 25T TOP GEAR-SOME TURBO R MODELS HAVE 27T TOP AND THESE COMBOS MAY NOT FIT WITH 27T TOP GEAR): The oem bottom gear and chain are 45t- 108 chain. The HRSS BIG MPH Rexnard kit includes a gear and chain for the 900 turbo to gear the monster up. This works well with 195-235 hp flashed sleds. Typically they gain 5 mph with the 43 , 7 mph with the 42 combo and 8-9 mph with the 41 combo. 11-12 mph with 38 combo. The chain takes some of the dogleg out of the stock chain for more efficiency. NOTE: some sleds can fit a 104chain with 41t bottom gear but some do not (all kits now shipped 41t-106 chain unless customer specified differently in notes at checkout). The 2022 Mach Z has a 27-45 gear combo with 110 link Rexnard chain and the top gears cannot be changed to a MXZ style gear. All 2023 900R MODELS have the 27-45 and 110 chain (42 & 43 bottom gears need a 108 chain for this sled, 38 & 41 tooth can run a 106 chain)
The bottom gears in our Big Mph kits are the narrow machined center splined gears for the 2021-2023 models only!
CAREFULLY SELECT THE GEAR & CHAIN COMBO YOU WANT!