BOLD MAGENTA part numbers are new for 2026 PARTS-UNLIMITED.COM 2026 | OFFROAD ENGINE ENGINE 1294 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”. CYLINDER HEAD SERVICE KITS (CONT) FITS MODEL PART # HONDA CRF250R 04-07, CRF250X 04-17 0926-3289 CRF450R 02-08 0903-1584 CRF450R 07-08 0903-1595 CRF450X 05-17 0903-1585 SUZUKI DR-Z400 00-24 0926-3290 FITS MODEL PART # YAMAHA YZ250F 14-16 0903-1304 WR450F 03-06 0903-1588 WR450F 07-15 0903-1589 YZ450F 03-05 0903-1588 YZ450F 06-09 0903-1589 TOP-END SERVICE KITS •These kits give your bike a performance boost •Kits include all necessary parts for a complete top-end service/rebuild: pistons, piston rings, piston pins, gaskets, valves and valve springs •Pistons fully machined from 2618 aluminum alloy with a performance skirt coating •Black Diamond™ or White Diamond® engine valves (depending on application) •Lightweight racing valve springs kit with titanium valve spring retainers, dual springs and H.T. steel base washers (springs are suitable for use with high-performance cams) • All necessary gaskets, seals and O-rings included •Sold as a complete kit NOTE: The pistons, rings, valve and pin clips in this kit are designed to work together as a system.The are NOT compatible with OEM components and should ONLY be used with components in the kit. 0903-1588 0903-1584 DESCRIPTION SPECIFICATIONS KIT CONTENTS PART # SUZUKI (CONT) RM-Z450 08-25 Intake: max valve lift 0.415”, installed height 1.190”, seat pressure 61 lbs., open pressure 168 lbs.; Exhaust: max valve lift 0.415”, installed height 1.220”, seat pressure 56 lbs., open pressure 157 lbs. 4 titanium retainers, 4 valve springs, 4 steel base washers, Black Diamond intake/exhaust valves (2 each), 4 C674 valve guides, top-end gasket kit 0926-3130 YAMAHA WR/YZ250F 01-13 Max valve lift (intake/exhaust) 0.380”, 1.105” installed height, 39 lbs. seat pressure, 86 lbs. open pressure, 0.380” max lift 5 titanium valve spring retainers, 5 CrSi valve springs (3 intake/2 exhaust), 5 H.T. steel base washers, Black Diamond valves (3 intake/2 exhaust), C630 valve guides, top-end gasket kit 0926-3233 WR450F 16-21, YZ450F 14-19, YZ450FX 16-20 Max valve lift (intake/exhaust) 0.450”, installed height 1.185”, seat pressure 46 lbs., open pressure 155 lbs. 4 titanium retainers, 4 valve springs, 4 steel base washers,White Diamond® intake/exhaust valves (2 each), 4 C630 valve guides, top-end gasket kit 0926-3132
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