Ski-Doo Alpine 399 434 Front Track Drive Sprocket for Ski-Doo 1970-1973

Front Track Drive Sprocket for Ski-Doo Alpine 399/434

This front track drive sprocket is a direct-fit replacement for Ski-Doo Alpine 399 and 434 snowmobiles built between 1970 and 1973, designed to transmit engine power from the drive shaft to the track.

Overview

This front track drive sprocket is made for Ski-Doo Alpine 399 and 434 models from 1970 through 1973 and connects the front drive shaft to the track. A worn sprocket on your Alpine 399 or 434 can cause track slippage, vibration, and lost traction, so replacing it restores dependable power transfer. It suits riders and mechanics keeping these vintage Ski-Doo Alpine machines running.

Built For Performance

• Direct-fit replacement for the original front track drive sprocket on Ski-Doo Alpine 399 and 434 models
• Tooth geometry shaped to engage the track drive lugs properly
• Mounts to the front drive shaft in the factory location
• Built to handle the torque loads of the Alpine 399 and 434 engines
• Restores positive track engagement for consistent drive

Fits These Machines

• for Ski-Doo Alpine 399 (1970 to 1973)
• for Ski-Doo Alpine 434 (1970 to 1973)

On-The-Job Use

• Replacing a worn or damaged front drive sprocket during track service
• Restoring track drive on vintage Ski-Doo Alpine 399 and 434 snowmobiles
• Driveline maintenance on 1970 to 1973 Alpine models
• Track and suspension rebuilds on older Alpine machines

Specs At A Glance

Good To Know

Q: How do I know if my front track drive sprocket needs replacing? A: Signs include visible tooth wear, cracking, track slippage under load, or a skipping feel while riding. Checking the sprocket whenever the track is serviced helps catch these problems early.

Q: Does this sprocket fit both the Alpine 399 and Alpine 434? A: It is intended for Alpine 399 and 434 models built between 1970 and 1973, but drive shaft and track configurations can vary by serial number. Confirm your machine's year and driveline setup before ordering.

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