KAMIER 420 Drive Chain 102-Link Kit with Chain Breaker for 50–125cc Mini Bikes, ATV — 10 Master Links

The KAMIER 420 drive chain is a 102-link replacement chain kit—complete with a chain breaker and multiple master links—designed to fit 50cc to 125cc pit bikes, ATVs, go-karts, and mini bikes using a 420 sprocket.

This complete chain kit from KAMIER gives you the parts and tool to repair or swap a worn chain quickly. It’s sized for most small-displacement four-stroke machines (50cc–125cc) that use a 420 front and rear sprocket. The package includes the full 102-link chain, ten master links for flexible sizing, and a compact chain breaker so you can shorten or lengthen the chain on site without extra tools.

Will this chain fit my dirt bike, ATV, or go-kart?

Compatibility centers on sprocket pitch and engine class rather than brand alone. The KAMIER 420 chain is built for 420 pitch systems on many Chinese and Japanese mini bikes, pit bikes, ATVs, and go-karts in the 50cc–125cc range.

• Compatible with many models: CRF50, XR50, KLX110, PW80, TTR90, SSR 70/110/125, DR-Z110, RM60, and similar.
• Fits only 420 front and rear sprockets; not compatible with 428 rear sprockets.
• Chain length adjustable using included master links and chain breaker.

How do I adjust length and install the KAMIER chain?

Installation is straightforward with the included chain breaker and master links. Measure the required length against your sprockets, remove excess links with the breaker, and secure the chain with a master link; always verify tension and alignment before riding.

• Use the chain breaker to remove pins and shorten the chain by single links.
• Install a master link and clip; torque and safety retainer recommendations depend on your model.
• Check rear wheel alignment and set recommended chain slack for smooth operation.

What are the kit components and material advantages?

The kit bundles what you need for a field or garage replacement: one 102-link 420 drive chain, a compact chain-breaking tool, and ten master links so you can tailor the chain length. This saves trips to the parts store and makes on-the-spot fixes possible.

• 420 chain with 102 total links (51 internal + 51 external links).
• Chain breaker tool for pin removal and link adjustments.
• Ten master links included to increase or decrease link count as required.

How should I care for and maintain this chain to extend its life?

Routine cleaning, lubrication, and proper tensioning prolong chain life and improve performance. Inspect the chain and sprockets regularly for wear, replace if stretching or tooth damage appears, and lubricate after cleaning or wet riding conditions.

• Lubricate after every few rides and after cleaning to prevent corrosion and reduce wear.
• Keep chain tension within manufacturer specs to avoid premature stretching or sprocket wear.
• Replace both chain and sprockets if either shows significant wear for optimal meshing.

Who is this for: The KAMIER 420 102-link chain kit is aimed at riders, mechanics, and hobbyists who maintain small-displacement dirt bikes, mini bikes, ATVs, and go-karts that require a 420-chain system. It’s especially useful for owners of Chinese-manufactured pit bikes and common Japanese models who want a cost-effective, ready-to-install replacement with a handy chain breaker for on-site adjustments. If your machine uses a 420 front and rear sprocket and your current chain is worn, this kit offers the parts and tool to get you back on the trail quickly.