RK Racing Chain 428-series motorcycle chain M428H-140 — 140-link non O-ring, 2-point riveted durable construction

RK Racing Chain M428H-140 is a 140-link, standard non O-ring 428-series motorcycle chain built from Japanese steel for reliable strength and long wear in small-displacement bikes.

This M428H-140 from RK Racing Chain (RKM series) is manufactured in Malaysia to Japanese specifications, combining two-point riveted pins and curled bushings with pre-stressed, pre-stretched construction. It is intended for lighter street and off-road motorcycles where a durable, economical non O-ring chain is preferred over sealed designs.

How strong and durable is the M428H-140?

The chain is engineered to deliver consistent tensile strength and predictable wear life for 125cc-class street bikes and smaller off-road machines. Its build uses quality materials and assembly methods that raise fatigue resistance compared with many competing standard chains.

• Maximum tensile strength: 4,500 pounds/feet
• Maximum wear life index: 100 (factory-rated benchmark)
• Two-point riveted pins and curled bushings for improved joint life
• Pre-stressed and pre-stretched to reduce initial elongation

Will this chain fit my motorcycle and how do I measure compatibility?

The M428H-140 is a 428-series standard chain with 140 links and 12.7mm pin-to-pin pitch, matching bikes that call for 428 pitch chains. Confirm compatibility by checking your owner's manual or measuring your current chain’s pitch and link count.

• Pitch (pin to pin center): 12.7 mm (428 standard)
• Links included: 140 (adjustable length via master/clip link)
• 24.0 links per foot; pin length 16.85 mm
• Master link type: clip style for easier field repairs

What maintenance and service life can I expect from a non O-ring chain?

Non O-ring chains like this require more frequent lubrication and inspection than sealed chains, but they are lighter and simpler to service. With regular cleaning, proper tension, and lubrication, you can achieve reliable mileage and predictable wear performance.

• Recommended: clean and lube at regular intervals and after wet or dusty rides
• Inspect for elongation, tight spots, and pin wear periodically
• Replace when wear index or elongation exceeds safe limits

How heavy is the chain and what bikes is it intended for?

The M428H-140 is relatively lightweight and optimized for small-displacement machines. Its mass and strength balance make it well suited for urban street bikes and lower-capacity off-road machines where agility and low rotating weight matter.

• Weight: 1.85 pounds per 100 links (proportionally ~2.59 pounds for 140 links)
• Suggested maximum engine capacity: up to 125cc for street, 80cc for off-road use
• Designed for a range of small to lightweight motorcycles and pit bikes

Who is this for? The RK Racing Chain M428H-140 is aimed at riders and mechanics who need a trustworthy, serviceable non O-ring 428 chain for light street or off-road motorcycles. It suits owners who prefer simpler maintenance, lower cost replacement chains, and a product built to Japanese specs with proven joint construction methods.