RK EXCEL BL420MRU-120 MRU Black 420 x 120 Drive Chain

MRU features RK’s proprietary Ultra Thin Seal, U-Rings, where the thickness of the seal is less than 50% of the most common O-ring seal. This allows RK to design a Sealed Chain with the weight of a Non-Sealed Chain. MRU will feature 4 times longer chain life than comparable non-sealed 420 chains and will require less chain adjustments compared to non-sealed 420 chains.

The RK EXCEL BL420MRU-120 MRU Black 420 x 120 Drive Chain is a lightweight sealed motorcycle chain designed for reliable street and off-road performance. RK’s proprietary Ultra Thin Seal, or U-Ring, uses a seal thickness of less than half that of a common O-ring seal. This construction helps reduce friction and overall chain weight while retaining the durability advantages of a sealed chain.

Built for motorcycles using 420 chain applications, the MRU series is rated for up to 150cc on both street and off-road models, with support for engines producing up to 25 horsepower. Compared with a non-sealed 420 chain, it can provide up to four times longer chain life and may require fewer chain adjustments when properly installed, lubricated, and maintained. The black finish provides a clean appearance suited to a wide range of motorcycle applications.

The chain includes a clip-type master link for installation. Before purchasing, verify the motorcycle manufacturer’s recommended chain size, link count, and final-drive configuration. The RK EXCEL BL420MRU-120 is supplied as a 120-link chain and is intended for compatible 420 drive systems. Always follow the vehicle manufacturer’s service procedures and use appropriate chain alignment, tension, and lubrication practices.

Manufacturer: RK EXCEL
Vendor Part Number: BL420MRU-120
Product Model: MRU
Application: Compatible 420 chain motorcycle drive systems up to 150cc and 25 horsepower

Features:

• Chain Type: Sealed 420 drive chain with RK EXCEL Ultra Thin Seal U-Ring technology
• Color: Black
• Chain Length: 120 links
• Tensile Strength: 4,540 pounds
• Maximum Engine Rating: 150cc for street and off-road applications
• Maximum Horsepower: 25 HP
• Service Life: Designed to provide up to four times the life of comparable non-sealed 420 chains
• Maintenance: Designed to require fewer chain adjustments than comparable non-sealed 420 chains
• Master Link: Clip type included
• Fitment: Compatible with motorcycles specified for 420 drive chains within the manufacturer’s application limits
• Brand: RK EXCEL
• Manufacturer Part Number: BL420MRU-120
• Vendor Part Number: BL420MRU-120