Motorcycle chain kit: selection, fitting and maintenance

Why the chain kit is critical

Chain drive transmits all engine power to the rear wheel. A worn kit means power loss, unstable handling, and a risk of failure. The chain kit (chain + front sprocket + rear sprocket) is always replaced as a complete set — never a single part alone.

Understanding dimensions: 520, 525, 530

The number indicates the chain dimensions:

• First digit (5): chain pitch — 5/8 of an inch (15.875 mm) between each link
• Last two digits: internal width between plates in eighths of an inch

In practice:

• 520: the lightest and narrowest. Stock on bikes up to 600 cc, or lightweight conversions on larger sportbikes
• 525: the standard for mid-size and large displacement bikes (600-900 cc). Good weight-to-strength balance
• 530: the heaviest and most robust. Large displacement bikes (1000+ cc), touring, heavy machines

Fitting a 520 on a bike delivered with a 530 is possible but reduces service life. It is a track-oriented choice. For road use, stick to the original dimension.

O-ring, X-ring, Z-ring: which seal type?

The seals between plates retain grease inside the links and prevent dirt from entering:

• O-ring: classic round seal. Good protection, slightly higher friction. Most common in budget kits
• X-ring: X-shaped seal (two contact lips instead of one). Less friction, better sealing, longer life. Best value for money
• Z-ring: X-ring variant with an optimised profile. Similar performance to X-ring, sometimes better behaviour at high speed

Recommendation: for road use, an X-ring kit is the best choice. The price difference versus O-ring is small (10-20 EUR) and service life is significantly longer.

Counting the links

The number of links in your chain is specific to your model. You will find it in the workshop manual or on the original chain. Aftermarket kits often come with extra links — you will need to cut to length using a chain breaker.

Examples:

• Yamaha MT-07: 104 links in 525
• Honda CB500F: 108 links in 520
• Kawasaki Z900: 114 links in 525

The fitting procedure

Tools needed:

• Chain breaker/riveter tool (to cut the old chain and rivet the new one)
• Alignment tool or straight edge
• Torque wrench
• Chain lubricant for the initial greasing

Steps:

1. Remove the old chain — use the chain breaker to push out a pin and open a link. With a clip-type master link, a flat screwdriver is enough
2. Inspect sprockets — hook-shaped teeth (pointed, asymmetric) mean they need replacing. This is why you change the complete kit
3. Fit the new front sprocket — torque to spec (often 50-80 Nm + lock bolt). Use thread-lock or the supplied tab washer
4. Fit the new rear sprocket — check that bolts are torqued to spec (often 25-40 Nm) in a star pattern
5. Thread the new chain — pass it around the front sprocket, the rear sprocket, and close it with the master link
6. Rivet the master link — this is the critical step. Use an appropriate riveting tool. The pin must be flared evenly without splitting. A bad rivet means chain failure while riding
7. Align the chain — use the marks engraved on the swingarm or a straight edge placed along the chain. Both sides must be symmetrical
8. Set the tension — standard free play is 25-35 mm at the lowest point, with the bike on its side stand. Check your manual for the exact value

Never over-tighten the chain. A chain that is too tight prematurely wears the sprockets AND the gearbox output shaft bearings. Slightly loose is better than too tight.

Initial lubrication and ongoing maintenance

After fitting, apply a generous coating of lubricant along the entire chain. Let it soak in for 10 minutes before riding. After that, lubricate the chain every 500-800 km or after any ride in the rain.

• Lubricate the chain when warm (after riding) — heat opens the seals and the lubricant penetrates better
• Apply on the inside face (sprocket side) — centrifugal force distributes the lube
• Clean periodically with a dedicated chain cleaner — never use aggressive solvents (WD-40, white spirit) that attack the seals

Service life

A well-maintained chain kit lasts between 15,000 and 30,000 km depending on quality, riding style, and lubrication diligence. A neglected kit can fail at 8,000 km.

Try L'Atelier free for 10 days — find the exact chain specs for your motorcycle (dimension, link count, torque values) in seconds, no credit card required.