RK Upgrade Kit Suzuki GSX1100 FJ / FK 530 Chain Conversion 88-89. 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. RETCH KTM SIDE PANELS 2019-22 KTM SX/SX-F, VINTAGE LIGHT BLUE. RETCH KTM SIDE PANELS 2019-22 KTM SX/SX-F, NEON ORANGE. RETCH KTM SIDE PANELS 2019-22 KTM SX/SX-F, BLACK. RETCH KTM SIDE PANELS 18-23 KTM 85 SX, VINTAGE LIGHT BLUE.