The EK 420 H/Duty Chain 136L (20) is a purpose-built heavy-duty roller chain crafted for demanding drive systems that power everything from off-road machines to small industrial setups. With a generous 136-link length per chain and a convenient pack of 20, this kit is designed for longevity, reliability, and quick maintenance swaps when you need them most.

Why this chain stands out

• 136-link length provides flexible configuration options for longer drives or custom setups, while staying compatible with standard 420-series sprockets.
• Heavy-duty performance is engineered to handle higher torque and tougher conditions than typical duty chains, making it a dependable choice for rugged riding and demanding equipment.
• Standard 420 pitch ensures broad compatibility with widely used sprockets in dirt bikes, ATVs, go-karts, and other 420-equipped machines.
• Value pack includes 20 chains, giving you ready replacements for maintenance cycles, spare kits for clubs, fleets, or workshops, and less downtime waiting for refits.
• Consistent engagement designed for smooth power transfer under load, reducing the risk of skipping or uneven wear on challenging terrain and setups.

Ideal use cases

• Replacing worn or stretched chains on dirt bikes, ATVs, and go-karts that rely on reliable 420-series drive systems.
• Custom builds or longer-drive configurations where extra chain length adds installation flexibility without compromising performance.
• Workshops, clubs, or seasonal fleets that benefit from a bulk-pack replacement solution to minimize downtime and manage inventory.

Practical tips for installation and care

• Verify fitment with your sprockets and ensure the chain length matches your drive configuration before installation.
• Lubricate with a quality roller-chain lubricant to maximize life and keep debris from causing excessive wear in dusty environments.
• Set proper tension according to your equipment’s guidelines, then recheck after a short break-in period to maintain optimal performance.
• Store spare chains in a dry, cool place to prevent rust and preserve the chain’s structural integrity for future use.