RK Racing Chain 4067-949S Steel Rear Sprocket and 520XSO Chain 520 Steel Conversion Kit

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Price: $131.93 $128.45   

Product Feature

• Fits: Yamaha YZF600R 94-07
• 520 steel conversion kit contains: 14 tooth chromoly front sprocket; 47 tooth steel rear sprocket; and RK 520XSO-108 link chain
• RK's new XSO chains offer quality, performance and unbeatable value, for all but the most demanding high performance application
• Viewed in cross-section, the RK 'RX-ring' has two lubrication pools and seal points versus the single seal point/pool design of a regular O-ring chain
• All components of the MXZ4 chain are heat treated using RK's exclusive HIT (Heat Induction Transfer) process and include a clip type master link

Product Description

Fits: Yamaha YZF600R 94-07. 520 steel conversion kit contains: 14 tooth chromoly front sprocket; 47 tooth steel rear sprocket; and RK 520XSO-108 link chain. RK's new XSO chains offer quality, performance and unbeatable value, for all but the most demanding high performance application. Viewed in cross-section, the RK 'RX-ring' has two lubrication pools and seal points versus the single seal point/pool design of a regular O-ring chain. All components of the MXZ4 chain are heat treated using RK's exclusive HIT (Heat Induction Transfer) process and include a clip type master link.

RK Racing Chain 4067-949S Steel Rear Sprocket and 520XSO Chain 520 Steel Conversion Kit Review

First off, I had no trouble fitting this on a 2003 Yamaha YZF600r (not the R6!), so there should be no issues with any YZF600r (or Thundercat outside the US) from 1997-2007 since the model was unchanged during those years.

This kit works, but its worth noting that this is not a stock replacement set of chains and sprockets. The chain is a 520 (stock is 530) and the front sprocket is a 14 tooth (stock is 15).

What does this mean? The 520 chain is lighter (therefore, ostensibly weaker) than stock, while the changes to the gearing will make the bike feel like it accerlerates faster at the expense of fuel mileage(since the engine will be reving higher at lower speeds thanks to the gearing change by having a smaller front sprocket) and potential top speed (which no one will ever legally need on public highways).

In practice and on the road, the gearing changes are subtle, yet noticeable. While the bike feels slightly "peppier" at town speeds, the increased engine revs at highway speeds are noticeable, and the attendant increase in vibration as a result is noticeable, as well as the loss of fuel efficiency that accompanies higher engine RPMs.

Bottom line, I purchased this chain and sprocket kit because it was significantly cheaper than the stock replacements, and at my old chain had been developing tight spots that made it sound like a choo-choo train. Not sure I'm happy with the gearing changes or the lighter chain, but if someone doesn't mind the inherent sacrifices to longevity and fuel mileage for a bit of a low end boost, this chain is a cheap alternative to stock chain/ sprocket replacements.

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