420-78 Drive Chain for Suzuki JR50 1978-2006 JR 50

420-78 Drive Chain for Suzuki

The 420-78 drive chain is a 78-link replacement chain that transfers power from the countershaft sprocket to the rear wheel sprocket on small-displacement mini bikes and youth machines.

Overview

This 420-78 drive chain is a direct-fit replacement for worn or stretched chains on small mini bikes, and it keeps power delivery smooth from the engine to the rear wheel. Riders and mechanics choose this 420-78 drive chain when a stock chain has developed tight spots, seized links, or excessive slack. It suits routine maintenance and full drivetrain refreshes alike.

Built For Performance

• 420 pitch sizing matches standard mini bike sprockets
• 78 links provide the correct length for the listed applications
• Roller construction supports consistent power transfer
• Pre-stretched design helps limit early elongation
• Includes master link for straightforward installation

Fits These Machines

• for Suzuki JR50
• for Suzuki JR 50

On-The-Job Use

• Routine drivetrain maintenance on youth mini bikes
• Replacing a stretched or broken chain after trail riding
• Restoring smooth acceleration on older machines
• Seasonal tune-ups before riding weather begins

Specs At A Glance

Good To Know

Q: How do I know if my chain needs replacing? A: Check for tight spots, kinked links, or the ability to pull the chain away from the rear sprocket. Excess slack that cannot be adjusted out usually means it is time for a new chain.

Q: Should the sprockets be replaced at the same time? A: Worn sprocket teeth will accelerate wear on a new chain, so inspect both sprockets closely. Replacing them together helps the drivetrain last longer.

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