BOLD MAGENTA part numbers are new for 2025 ENGINE PARTS-UNLIMITED.COM OFFROAD | 2025 ENGINE 1253 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 TYPE HEAD DIAMETER OD X ID X HEIGHT PART # HONDA CRF250R/X 04-17 Intake 34 mm 1.339” x 1.024” x 0.375” 0926-1635 CRF250R 04-09/X 04-16 Exhaust 29 mm 1.142” x 0.827” x 0.375” 0926-1631 CRF250R 10-16 Exhaust 28 mm 1.102” x 0.787” x 0.375” 0926-1630 CRF450R 02-17 Intake 39 mm 1.535” x 1.181” x 0.434” 0926-1638 CRF450R 02-08 Exhaust 35 mm 1.378” x 1.024” x 0.434” 0926-1636 CRF450R 09-12 Exhaust 34 mm 1.339” x 1.024” x 0.375” 0926-1635 CRF450R 13-17 Exhaust 35 mm 1.378” x 1.024” x 0.434” 0926-1636 KAWASAKI KX250F 04-16 Intake 32 mm 1.260” x 0.945” x 0.374” 0926-1633 Exhaust 28 mm 1.102” x 0.787” x 0.374” 0926-1630 KX450F 06-16 Intake 39 mm 1.535” x 1.024” x 0.434” 0926-1638 Exhaust 35 mm 1.378” x 1.024” x 0.434” 0926-1636 KLX450R 08-16 Intake 38.5 mm 1.496” x 1.142” x 0.434” 0926-1637 Exhaust 34 mm 1.339” x 1.024” x 0.375” 0926-1635 SUZUKI RM-Z250 04-16 Intake 32 mm 1.260” x 0.945” x 0.374” 0926-1633 Exhaust 28 mm 1.102” x 0.787” x 0.374” 0926-1630 DR-Z400 01-16 Intake 38 mm 1.496” x 1.142” x 0.434” 0926-1637 Exhaust 32 mm 1.260” x 0.945” x 0.374” 0926-1633 RM-Z450 05-06/08-14 Intake 38 mm 1.496” x 1.142” x 0.434” 0926-1637 Exhaust 33 mm 1.299” x 0.984” x 0.375” 0926-16344 YAMAHA WR250F 01-14,YZ250F 01-13 Intake 25 mm 0.984”x 0.669”x 0.355” 0926-16291 Exhaust 28 mm 1.102” x 0.787” x 0.374” 0926-16301 YZ450F 03-09,WR450F 03-16 Intake 29 mm 1.142”x 0.827”x 0.375” 0926-16312 Exhaust 31 mm 1.220”x 0.906”x 0.375” 0926-16322 YZ450F 10-13 Intake 39 mm 1.535”x 1.181”x 0.434” 0926-16383 Exhaust 33 mm 1.299”x 0.984”x 0.375” 0926-16343 1 YZ250F 01-14/WR250F 01-13 are 5-valve engines using three intake seats and two exhaust seats. 2 YZ450F 03-09 and WR450F 03-16 are 5-valve engines using three intake seats and two exhaust seats. 3 YZ450F 10-13 are 4-valve engines using two intake and two exhaust seats. 4 For RM-Z450 08-14 only. IRON ALLOY VALVE SEATS FOR STEEL VALVES •Premium valve seats for applications using steel valves •A specific combination of alloys allowed a creation of a high-density, iron-based valve seat with uniform hardness, exceptional thermal qualities and high resistance to wear and recession caused by microwelding •Only by using the latest developments in powdered metal technology were we able to blend these alloys to create a seat material with the qualities required for today’s engines •These seats have been tested on the track and street in high-rpm applications with leaded, unleaded, and oxygenated fuel, as well as methanol, ethanol, nitrous and forced induction applications •Sold each •Made in the U.S.A. NOTE: All applications listed use two intake and two exhaust seats, unless otherwise noted. NOTE: Verify size before ordering. FITS MODEL PART # HONDA CRF250R/X 04-07 0926-0652 CRF450R 02-06 0926-0654 FITS MODEL PART # HONDA (CONT) CRF450R 07-16 0926-0652 CRF450X 05-17 0926-0654 FITS MODEL PART # YAMAHA WR450F 03-11 0926-0661 YZ450F 03-09 0926-0661 VALVE SEAL KITS • Made from premium Viton® material and offer superior oil control •Exhibit the least amount of parasitic drag and wear on the valve, giving greater life of the valve and better power •Fit OE valve and valve guide dimensions for many applications 0926-0652 0926-0661 0926-1637
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