RK Upgrade Kit Yamaha FZR750 RR OWO1 530 Conversion Kit 89-90. Terms and conditions apply. RK OE upgrade chain and sprocket chain and sprocket kits contain a heavier duty RK chain than that supplied as OE on the motorcycle when new. They are supplied with high quality steel sprockets. Sorry, our items are NOT available for pick-up. No additional information at this time. You might also like. Oakley O Frame MX Goggles Clear Lens Various Colors. (NLA) ProX Crankseal Set KFX80 03-06. Oakley Replacement Lens O Frame 2.0 MX Motocross (Fire Irdium) Genuine. RETCH KTM SIDE PANELS 18-23 KTM 85 SX, VINTAGE LIGHT BLUE.