Ski-Doo 600 ACE Secondary Driven Clutch Assembly (2020-2026)
Updated June 23, 2026
This secondary driven clutch is a key component of the continuously variable transmission (CVT) system on 2020-2026 Ski-Doo snowmobiles equipped with the 600 ACE engine. Mounted on the jackshaft, it receives power from the drive belt and transfers it to the track, while automatically adjusting its effective diameter to vary the gear ratio based on load and speed. The assembly includes the clutch sheaves, spring, rollers, and the jackshaft itself, making it a direct replacement for the original part (OEM 417127751).
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Function and Design
The secondary clutch works in tandem with the primary clutch to provide seamless ratio changes without a manual transmission. As the primary clutch shifts, the belt rides higher or lower in the secondary sheaves. The secondary clutch uses a helical ramp and spring-loaded mechanism to apply clamping force on the belt, which is proportional to torque demand. This design allows the engine to operate in its optimal power band while the clutch adjusts to terrain and load. The unit shown includes the jackshaft, bearings, bushings, and rollers, all of which are critical for smooth operation.
Vehicle Compatibility
This secondary clutch assembly is designed for Ski-Doo models powered by the 600 ACE Sport engine from model years 2020 through 2026. Confirmed fitments include the Grand Touring 600 ACE Sport, Expedition 600 ACE Sport, and Renegade 600 ACE Sport (both 137" and 154" track lengths). The OEM part number is 417127751. Always verify your snowmobile's year, model, and engine type before installation. This assembly is not compatible with non-ACE engines or earlier chassis designs.
Common Failure Symptoms and Diagnosis
Wear or damage to the secondary clutch can cause belt slipping, sluggish acceleration, unusual vibrations, or a squealing noise during operation. Sticking rollers or worn bushings may prevent the clutch from opening and closing smoothly, leading to inconsistent ratio changes. A visual inspection should check for cracks in the sheaves, flat spots on rollers, and excessive play in the jackshaft bearings. If the clutch fails to return to its low-ratio position when the engine is off, the spring or ramp may be worn. The listings note that this used unit has good bearings, bushings, and rollers, with no cracks and straight sheaves.
Installation Notes
Replacing the secondary clutch requires removing the drive belt, loosening the jackshaft bolt, and sliding the old assembly off. The new unit slides onto the splined jackshaft and must be torqued to the manufacturer's specification (not provided here). Proper belt alignment and deflection must be set after installation. Because this part includes the jackshaft, it may simplify the replacement if the original shaft is damaged. Always use a clutch holding tool to prevent rotation during bolt tightening. If reusing the original belt, inspect it for wear before reassembly.
