OFFROAD BOLD MAGENTA part numbers are new for 2023 PARTS-UNLIMITED.COM 2023 | OFFROAD UPDATE PISTON & PISTON KITS 232 FITS MODEL DESCRIPTION COMPRESSION RATIO BORE (MM) PART # SUG. RETAIL YAMAHA WR250F 20-22 Standard bore cylinder - 77 0931-1117 $323.95 Standard bore cylinder kit 13.8:1 77 0931-1118 538.95 +3mm Big Bore gasket kit - - 0934-7521 99.95 YZ250F 19-22 Standard bore cylinder - 77 0931-1117 323.95 Standard bore cylinder kit 13.8:1 77 0931-1118 538.95 +3mm Big Bore gasket kit - - 0934-7521 99.95 YZ250FX 20-22 Standard bore cylinder - 77 0931-1117 323.95 Standard bore cylinder kit 13.8:1 77 0931-1118 538.95 +3mm Big Bore gasket kit - - 0934-7521 99.95 CYLINDERS AND CYLINDER KITS • Ready-to-install, direct bolt-on cylinders require no re-plating and look virtually identical to the OEM cylinders • Cylinder kits include matched Vertex pistons to ensure longevity, performance and reduced engine noise •Nickel silicon carbide-plated for long life FITS MODEL DISPLACEMENT BORE OVERSIZE COMPRESSION RATIO PART # SUG. RETAIL HONDA CRF250R 20-22 249cc 79mm STD 14.0:1 0910-6551 $340.69 249cc 79mm STD 14.5:1 0910-6552 340.69 YAMAHA YZ250F 20-22 250cc 77mm STD 14.0:1 0910-6543 250.64 250cc 77mm STD 14.5:1 0910-6544 250.64 PISTONS •Machined from 2618-T6 high-tensile forged aluminum •Dome/dish features smooth flowing radii; require no deburring or preparation •JE designs are specifically engineered for extreme applications including professional competition •Pro Series pistons available for select models: features include internal and external bracing, dedicated embossed forgings for weight reduction, specialized processes such as internal milling the internal struts, along with dedicated accumulator groove and forged side relief • Pins, pin fitment, lock and rings included •Made in the U.S.A. •See pages 1177-1178 of the 2023 Parts Unlimited Offroad catalog for the full line of JE Pistons 0910-6551 • Kits come complete with gaskets, cylinder, piston, rings, pin and clips • Replacement Vertex piston, rings, clips and pins also available; see pages 1183-1199 of the 2023 Parts Unlimited Offroad catalog •Made in the U.S.A. 0931-1118
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