SUPPORT

Welcome to DY Chain Support Center. Find everything you need to select, install, maintain, and troubleshoot your motorcycle chain. Whether you're a dealer, mechanic, or rider, our comprehensive guides help you get the most out of your DY chain.

Chain Selection Guide

How to select the chain specification based on the engine displacement of a motorcycle?

Motorcycle displacement	Recommended chain specifications	Motorcycle type
50cc – 125cc	420, 428	Scooters, off-road vehicles
125cc – 250cc	428, 520	Trams, commuter motorcycles
250cc – 600cc	520, 525	Medium-displacement sports motorcycles
600cc – 1000cc+	530	Large-displacement, high-torque motorcycles

How to choose the type of chain?

Chain type	Applicable scenarios	Maintenance frequency
Non O-Ring Chain	Off-road, mud-terrain racing, scenarios emphasizing lightweight design	Lubrication every 300 - 600 kilometers
O-Ring Chain	Trams, commuting, daily cycling	Lubrication every 600 - 1000 kilometers
Silent/Timing Chain	Engine timing system, oil pump drive mechanism	Regular inspection, replace every 30,000 - 50,000 kilometers

Contact us for product selection assistance.

Chain Size Chart

Drive Chain

Chain specification	Pitch	Inner Width	Roller Dia.	Applicable scenarios
420	1/2″ (12.70mm)	1/4″ (6.35mm)	7.75mm	Lightweight off-road, 50 - 125cc
428	1/2″ (12.70mm)	5/16″ (7.94mm)	8.51mm	125 - 250cc street bike
520	5/8″ (15.88mm)	1/4″ (6.35mm)	10.16mm	250 - 600cc sports motorcycles
530	5/8″ (15.88mm)	3/8″ (9.53mm)	10.16mm	600cc+ Large-displacement motorcycle

Timing Chain / Silent Chain

Chain NO.	Pitch	Inner Width	Pin Dia.	Average tensile load	Applicable Instructions
25	6.35mm	3.10mm	2.31mm	4.30KN	Standard timing chain
25H	6.35mm	3.10mm	2.31mm	5.60KN	Enhanced timing chain
25N	6.35mm	3.10mm	2.31mm	5.60KN	Enhanced timing chain
CL04-5	6.35mm	3.15mm	2.50mm	5.50KN	Silent timing chain
CL04-7	6.35mm	5.20mm	2.50mm	8.20KN	Wide-body silent chain
CL04-9	6.35mm	7.20mm	2.50mm	10.50KN	Wide-body silent chain

Additional Explanation:

Pitch: The distance between the pins of the chain, which determines the compatibility between the chain and the sprocket.

Inner Width: The width of the chain on the inner side, which determines the strength of the chain and the applicable torque.

Chain Type Guide

Non O-Ring Chain (Non-sealing Ring Chain)

Features: Simple structure, light weight, affordable price

Advantages: Intuitive maintenance, low cost, suitable for muddy environments (less likely to get stuck by mud and sand)

Disadvantages: Requires more frequent lubrication and cleaning

Recommended product: 428H Gold Drive Chain (Suggested replacement every 3,000 miles)

O-Ring / X-Ring Chain (Sealing Ring Chain)

Features: Contains O-type or X-type sealing rings between the pin shaft and the rollers

Advantages: Sealing grease does not leak easily, longer lifespan, longer maintenance interval

Disadvantages: Slightly heavier, higher price

Applicable scenarios: Street bikes, commuting, long-distance cycling

Silent Chain / Timing Chain

Features: Toothed chain structure, extremely low operating noise

Advantages: 5-8 decibels quieter than traditional roller chains, high precision, long lifespan

Applicable scenarios: Engine timing system, oil pump drive, balance shaft drive

Installation Guide

01/

Preparation

Confirm that the new chain specification matches the original vehicle (refer to the size comparison table above)

Prepare tools: chain cutter, grinding wheel machine, torque wrench, caliper

02/

Remove the old chain

Before using the chain cutter, first grind off the part where the pins are riveted with a grinding wheel machine

Remove the old chain and the front and rear sprockets (it is recommended to replace both the sprocket and the chain at the same time)

03/

Install the new chain

Pass the new chain through the front and rear sprockets, ensuring alignment

Use spring-type joint link or riveted joint for connection

Note: The riveted joint is the recommended connection method by brands such as RK

04/

Adjust the chain tension

The ideal tension is approximately 2%-3% of slack

Check the free travel of the chain at the tightest point

05/

Final inspection

Confirm that the sprocket and the chain are in the same plane (alignment)

Manually rotate the rear wheel and check for any sticking or abnormal noise

Maintenance Guide

Lubrication

Maintenance project	Frequency	Explanation
Chain lubrication	Every 300 - 600 kilometers (200 - 400 miles)	Off-road / harsh environments should be visited more frequently
Chain tightness check	Check approximately 500 kilometers (300 miles) after the first installation	Check every 1000 kilometers thereafter
Chain cleaning	Every 1,000 kilometers or as the situation may require	Use the dedicated chain cleaner

Lubrication steps:

Ride for a short distance to preheat the chain (warm up).
Use a special chain cleaner to clean the chain.
After it dries, apply the chain lubricant or chain oil evenly.
Allow the lubricant to penetrate for a few minutes, then wipe off the excess portion.

Chain Inspection

Wear Inspection: Measure the degree of chain stretching (Replacement is required if stretching exceeds 2%-3%).
Roller Inspection: Check if the rollers rotate smoothly and if there is any abnormal wear.
Sealing Ring Inspection (O-Ring/X-Ring): Check if the sealing rings are intact and if there are any cracks.
Sprockets Inspection: Check if the sprockets teeth have worn into a hooked shape (Replacement is required simultaneously).

Replacement cycle

Non O-Ring Chain: It is recommended to inspect every 3,000 miles (approximately 5,000 kilometers) and replace it if worn.
O-Ring/X-Ring Chain: It is recommended to replace every 20,000 miles (approximately 32,000 kilometers).
Always replace both the front and rear sprockets simultaneously.

FAQ

Q1: Are you a manufacturer or trading company?

We are a professional motorcycle chain manufacturer with over 20 years of experience.

Q2: Can you do OEM/ODM for us?

Yes, we offer full OEM and ODM services including custom colors, custom packaging, and private labeling.

Q3: What certifications do you hold?

We hold ISO9001 and other quality certifications.

Q4: What is your MOQ?

Our MOQ is 500 pcs. Sample orders are also welcome.

Q5: Can I get a sample?

Yes, samples are available.

Q6: What is your warranty period?

12-month after-sales service

Q7: How do I choose the right chain for my motorcycle?

Please refer to our Chain Selection Guide and Size Chart above. Of course, you can also directly contact us.

Q8: How often should I lubricate my chain?

Every 300-600 km (200-400 miles) for non-sealed chains, and every 600-1000 km for sealed chains.

Q9: Do I need to replace sprockets when changing the chain?

Yes, we strongly recommend replacing both sprockets when installing a new chain to ensure proper fit and longevity.

Q10: What is the difference between O-Ring and Non O-Ring chain?

O-Ring chains have built-in seals that retain lubrication longer, while Non O-Ring chains are lighter and suitable for off-road conditions.

Download

Huzhou Dongyao Chain Industry Co., Ltd.