Front Track Drive Sprocket for Ski-Doo Blizzard 640 645 776 797 1970-1971

Front Track Drive Sprocket for Ski-Doo Blizzard

This front track drive sprocket is a replacement driveline component for 1970-1971 Ski-Doo Blizzard models including the 640, 645, 776, and 797, transferring power from the drive axle to the track.

Overview

The front track drive sprocket is the toothed drive wheel that engages the track and turns engine power into forward motion on the snow. Made for vintage Ski-Doo Blizzard machines from 1970 through 1971, including the 640, 645, 776, and 797, this sprocket replaces a worn or damaged original so the track bites and drives as it should. It suits vintage snowmobile restorers and riders keeping a classic Blizzard on the trail.

Built For Performance

• Toothed profile built to engage the internal lugs of the Blizzard track
• Direct replacement for a stripped or broken front drive sprocket
• Mounts on the front drive axle in the original position
• Restores positive track drive under acceleration and load
• Sized to the driveline of 1970-1971 Blizzard models

Fits These Machines

• for Ski-Doo Blizzard 640 1970-1971
• for Ski-Doo Blizzard 645 1970-1971
• for Ski-Doo Blizzard 776 1970-1971
• for Ski-Doo Blizzard 797 1970-1971

On-The-Job Use

• Rebuilding a vintage Blizzard driveline during track service
• Replacing stripped cogs after a season of hard riding
• Restoring a classic Blizzard sled to running condition
• Servicing the front drive axle during seasonal maintenance

Specs At A Glance

Good To Know

Q: How can I tell the drive sprocket is worn out? A: Chipped or missing teeth, a polished or rounded tooth profile, and a track that slips under throttle are common signs of a worn sprocket. Cracks around the hub or splines are signs it should be replaced before the next ride.

Q: Do I need to replace both sprockets on the front axle? A: It is good practice to inspect every sprocket on the drive shaft and replace any that show matching wear. Mixing a new sprocket with a badly worn one can cause uneven track engagement.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.