The RK 420 MRU chain is a lightweight, low-friction drive chain designed for select small-displacement motorcycles, including the Honda Monkey and Honda Grom. With 130 links and a black finish, this sealed 420-pitch chain provides dependable performance for street riding and everyday use. The chain is manufactured by RK and identified by manufacturer and vendor part number BL420MRU-130.
RK MRU chains use proprietary Ultra Thin Seal U-Rings that are less than half the thickness of common O-ring seals. This design helps reduce friction while retaining effective lubrication and contamination protection at the chain joints. Compared with comparable non-sealed 420 chains, the MRU design is engineered to provide up to four times longer chain life and require fewer chain adjustments when properly installed, lubricated, and maintained.
Before installation, verify compatibility with the motorcycle’s year, model, sprocket configuration, and required chain length. This RK 420 MRU chain is suited for applications requiring a 420-pitch sealed chain and is a practical replacement option for compatible Honda Monkey and Honda Grom models. Proper alignment, adjustment, lubrication, and routine inspection are essential for maximizing service life and maintaining smooth power transfer.
Features:
- Brand: RK
- Model: 420 MRU
- Manufacturer and vendor part number: BL420MRU-130
- Chain size: 420 pitch
- Link count: 130 links
- Seal design: Proprietary Ultra Thin Seal U-Rings
- Performance: Engineered for up to four times longer chain life than comparable non-sealed 420 chains
- Maintenance: Designed to require fewer chain adjustments than comparable non-sealed 420 chains
- Construction: Lightweight, low-friction, sealed chain
- Fitment: Select Honda Monkey and Honda Grom applications; verify year, model, and sprocket configuration before installation
- Finish: Black