The RK Excel BL420MRU-130 MRU Drive Chain is a lightweight, sealed motorcycle chain designed for street and off-road applications up to 150cc. Built with RK’s proprietary Ultra Thin Seal (U-Ring) technology, this 420 chain combines the reduced weight of a non-sealed chain with the added durability and protection of a sealed design. The thin seal profile helps minimize friction while retaining lubricant and blocking contaminants.
Engineered for dependable performance, the MRU chain is rated for motorcycles producing up to 25 horsepower and delivers approximately four times the service life of comparable non-sealed 420 chains. Its sealed construction also helps reduce the frequency of chain adjustments, making it a practical replacement for riders seeking consistent drivetrain performance and lower maintenance requirements.
This black RK Excel drive chain measures 420 size and includes 130 links with a clip-style master link for installation. It is suitable for compatible street motorcycles, dual-sport models, and off-road motorcycles within the stated capacity ratings. Verify the motorcycle manufacturer’s fitment requirements, sprocket compatibility, and required chain length before installation. The manufacturer part number is BL420MRU-130, and the vendor part number is 691-1802BK.
Features:
- Size: 420 drive chain with 130 links
- Model: MRU sealed motorcycle chain
- Brand: RK Excel
- Manufacturer Part Number: BL420MRU-130
- Vendor Part Number: 691-1802BK
- Construction: RK Ultra Thin Seal U-Ring design
- Fitment: Compatible street and off-road motorcycles rated up to 150cc when matched to the correct sprockets and chain length
- Performance: Rated for engines producing up to 25 horsepower
- Durability: Designed to provide approximately four times the service life of comparable non-sealed 420 chains
- Maintenance: Sealed design helps reduce chain adjustments compared with non-sealed 420 chains
- Tensile Strength: 4,540 pounds
- Master Link: Clip-style master link included
- Color: Black