RK Xtreme Upgrade Kit Yamaha YZF-R6 – 530 Chain Conversion Kit 99 – 02. Terms and conditions apply. RK Xtreme OE upgrade chain and sprocket kits contain premium OE upgrade RK drive chain. Sorry, our items are NOT available for pick-up. No additional information at this time. You might also like. RTECH PLASTIC KIT/6 CRF450 13-16, CRF 250 14-17 RTECH R-KITCRF-GF0-517 NEON YEL. RTECH LOWER FORK GUARDS CR CRF CRFX. RTECH FRONT NUMBER PLATE 20-22 BETA WHITE. RTECH FRONT NUMBER PLATE 20-22 BETA BLACK.