The RK Excel 520SO-104 drive chain is a traditional round O-ring chain designed for riders seeking dependable performance and affordability. Built for low- to mid-range motorcycles that originally use sealed chains, this 520-size chain is suitable for both street and off-road applications on motorcycles and ATVs up to 400cc. Its natural steel finish provides a practical, durable solution for everyday riding and replacement applications.
The RK Excel 520SO features Nitrite Butadiene O-rings that help retain internal lubrication while limiting seal-ring drag and power loss. This construction supports smooth power transfer, consistent operation, and reduced maintenance compared with a non-sealed chain. The chain includes a clip-style master link for installation and is supplied in a 104-link configuration.
Fitment is intended for compatible motorcycles and ATVs equipped for a 520 chain size, with a maximum recommended rating of 400cc for street use and 400cc for off-road or ATV use. Always verify the original equipment chain size, link count, clearance, and manufacturer recommendations before installation. The RK Excel manufacturer part number and vendor part number are both 520SO-104.
Features:
- Brand: RK Excel
- Manufacturer Part Number: 520SO-104
- Vendor Part Number: 520SO-104
- Chain Size: 520
- Chain Length: 104 links
- Chain Type: Round O-ring sealed drive chain
- Material and Finish: Steel with natural finish
- O-Ring Material: Nitrite Butadiene
- Tensile Strength: 6,900 pounds
- Maximum Application Rating: 400cc street, 400cc off-road or ATV
- Maximum Horsepower: 60 horsepower
- Master Link: Clip type included
- Recommended Fitment: Low- to mid-range motorcycles and ATVs originally equipped with sealed 520 chains