BOLD MAGENTA part numbers are new for 2025 PARTS-UNLIMITED.COM 2025 | OFFROAD ENGINE ENGINE 1252 DISCLAIMER: *EMIS (EMISSIONS CATEGORIZATION CODE). SEE PAGES 4-6 FOR CATEGORY CODES, IMPORTANT EPA/CARB EMISSION DEFINITIONS AND REGULATORY COMPLIANCE AND NOTICE REGARDING NOISE REGULATIONS. PRODUCTS NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES IF NOT CATEGORIZED AS “1” OR “4”. FITS MODEL SINGLE INTAKE VALVE SINGLE EXHAUST VALVE HONDA CRF450R 02-08 0926-2561 - CRF450X 05-17 0926-2561 - FITS MODEL SINGLE INTAKE VALVE SINGLE EXHAUST VALVE YAMAHA YZ250F 14-18 0926-2887 - YZ450F 03-09 - 0926-2557 YZ450F 14-17 0926-2898 - X2 TITANIUM VALVES •Offers the off-road enthusiast superior performance at an excellent value •Incorporates a high-flow design for maximum power and long service life • Features the finest materials, tightest tolerances and best finishes • X2 Titanium Valves are full CrN-coated for extended service life •The X2 valvetrain kits are complete with high-performance valves matched with the correct valve spring as well as precision retainers, spring seats and valve locks FITS MODEL TYPE OD X ID X HEIGHT PART # HONDA CRF250R/X 04-17 Intake 1.339” x 1.024” x 0.375” 0926-1625 CRF250R 04-09/X 04-16 Exhaust 1.142” x 0.827” x 0.375” 0926-1621 CRF250R 10-16 Exhaust 1.102” x 0.787” x 0.375” 0926-1620 CRF450R 02-17 Intake 1.516” x 1.142” x 0.434” 0926-1627 CRF450R 02-08 Exhaust 1.378” x 1.024” x 0.434” 0926-1626 CRF450R 09-12 Exhaust 1.339” x 1.024” x 0.375” 0926-1625 KAWASAKI KX250F 04-16 Intake 1.260” x 0.945” x 0.374” 0926-1623 Exhaust 1.102” x 0.787” x 0.374” 0926-1620 KLX450R 08-16 Exhaust 1.339” x 1.024” x 0.375” 0926-1625 KX450F 06-16 Intake 1.535” x 1.024” x 0.434” 0926-1628 Exhaust 1.378” x 1.024” x 0.434” 0926-1626 SUZUKI RM-Z250 04-16 Intake 1.260” x 0.945” x 0.374” 0926-1623 Exhaust 1.102” x 0.787” x 0.374” 0926-1620 DR-Z400 00-19 Exhaust 1.260” x 0.945” x 0.374” 0926-1623 RM-Z450 08-20 Exhaust 1.299” x 0.984” x 0.375” 0926-1624 YAMAHA WR/YZ250F 01-13 Intake 0.984” x 0.669” x 0.355” 0926-16191 Exhaust 1.102” x 0.787” x 0.374” 0926-16201 YZ450F 03-09,WR450F 03-16 Intake 1.142”x 0.827”x 0.375” 0926-16212 YZ450F 10-13 Intake 1.535”x 1.181”x 0.434” 0926-16283 Exhaust 1.299”x 0.984”x 0.375” 0926-16243 1 Yamaha WR/YZ250F 01 are 5-valve engines using three intake seats and two exhaust seats. 2 The YZ450F 03-09 and WR450F 03-13 are 5-valve engines using three intake seats and two exhaust seats. 3 The YZ450F 10-13 are 4-valve engines using two intake and two exhaust seats. VALVE SEATS FOR TITANIUM VALVES •Copper-based material designed specifically for use with titanium valves in high-performance applications •Give the seat excellent thermal characteristics as well as resistance to corrosion and wear •These seats are the result of a two-year KPMI R&D effort during which we recorded and verified results with 4- and 5-valve singles, multi-cylinder street bikes, and British and European 4-strokes • In each test the wear, thermal conductivity and machinability surpassed the standards we set for success •These seats are used by successful builders around the world in all forms of racing •Sold each •Made in the U.S.A. NOTE: All applications listed use two intake and two exhaust seats unless otherwise noted. 0926-1623
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