BOLD MAGENTA part numbers are new for 2026 ENGINE PARTS-UNLIMITED.COM OFFROAD | 2026 ENGINE 1295 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 INTAKE VALVE INTAKE VALVE HEAD DIAMETER EXHAUST VALVE EXHAUST VALVE HEAD DIAMETER EXHAUST GUIDE HONDA CRF250R 10-17 - - - - 0926-06021 CRF450R 02-06 - Std. 0926-0491 Std. 0926-0608 CRF450R 02-08 0926-0469 +1 mm 0926-0491 +1 mm 0926-06082 0926-0469 +1 mm 0926-0491 +1 mm - CRF450X 07-17 0926-0469 Std. - - - - - - - 0926-06082 YAMAHA WR450F 03-09 0926-0469 +1 mm (outer intake) - - - 1 4.5 mm. 2 5.5 mm. XCELDYNE BY CV4 VALVES •Titanium valves • Features an advanced “high-flow” design to increase flow by more than 15% over stock valves •Lightweight design increases rpm and horsepower • PVD-coated for outstanding wear-resistance in seat, tip and guide area •Sold each GUIDES •Built from Xceldyne’s specified blend of Manganese-bronze •Heat dissipation (thermal conductivity) and valve stem lubrication are substantially increased, which leads to extended valve stem life •Highest tolerances for correct valve stem support and fitment in cylinder head • Some models available with positive-stop “step” built in for easy installation and more importantly, the correct height • 2 piece, unless noted NOTE: Honda CRF450R 02-08 models without intake valves must use 5.5 mm valve guide PART #0926-0608. 0926-0608
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