BOLD MAGENTA part numbers are new for 2026 PARTS-UNLIMITED.COM 2026 | OFFROAD PISTON & PISTON KITS PISTON & PISTON KITS 1422 FITS MODEL BORE (MM) X STROKE (MM) DISPL. (CC) BORE SIZE (MM) OVER SIZES (MM) PK KIT PART # PISTON PART # REPL. RING SET PART # REPL. CIRCLIPS PART # REPL. WRIST PIN PART # TOP-END BEARING PART # YAMAHA 4-STROKE (CONT) WR250F 05-13,YZ250F 05-07 77 250 77 STD 0903-0559 0910-0808 - CW16 0913-0008 - 12.5:1 Compression x 263 79 2.0 - - 3110XG Nikasil Bore - Cylinder sleeving or replating required for oversizes. 53.6 WR250F 05-13,YZ250F 05-07 77 250 77 STD 0903-0558 - 0912-0140 CW16 0913-0008 - 13.5:1 Compression x 263 79 2.0 - - 3110XG Race Only; 2-ring. 53.6 ArmorGlide skirt coated. Nikasil Bore - Cylinder sleeving or replating required for oversizes. WR250F 15-17,YZ250F 14-15,YZ250FX 15-16 77 250 77 STD 0903-1143 - 0912-0140 CW16 - - 13.5:1 Stock Compression x Nikasil Bore. 53.6 YZ250F 01-04 77 249 77 STD - 0910-0806 0912-0140 CW16 0913-0008 - 13.5:1 Compression x Light weight, 2-ring, gas ported. 53.6 ArmorGlide skirt coated. YZ250F 08-11 77 250 77 STD 0903-0937 - - CW16 0913-0008 - 13.5:1 Stock Compression x 79 2.0 - - 3110XG ArmorGlide skirt coated. 53.6 Nikasil Bore. YZ250F 08-11 77 250 77 STD 0903-0938 - - CW16 0913-0008 - 14:1 High-Compression x ArmorGlide skirt coated. 53.6 Nikasil Bore. YZ250F 01-04 77 249 77 STD - 0910-0806 0912-0140 CW16 0913-0008 - 13.5:1 Compression x Light weight, 2-ring, gas ported. 53.6 ArmorGlide skirt coated. YZ250F 08-11 77 250 77 STD 0903-0937 - - CW16 0913-0008 - 13.5:1 Stock Compression x 79 2.0 - - 3110XG ArmorGlide skirt coated. 53.6 Nikasil Bore. YZ250F 08-11 77 250 77 STD 0903-0938 - - CW16 0913-0008 - 14:1 High-Compression x ArmorGlide skirt coated. 53.6 Nikasil Bore. TT350 85-98, XT350 85-00 86 346 86 STD - 0910-2916 3386XC - - - 9:1 Compression x 87 1.0 - 0910-1661 3425XC Cylinder boring and replating required for oversizes. 59.6 1.5 - 0910-2917 - WR400F 98-00,YZ400F 98-99 92 399 92 STD - 4649M09200 - CW18 - - 12.5:1 Compression x -8cc Dome Volume. 60.1 WR426F 01-02,YZ426F 00-02 95 426 95 STD - 4693M09500 - - - - x 97 2.0 - - - 12.5:1 Stock Compression 60.1 WR426F 01-02,YZ426F 00-02 95 426 95 STD - 0910-2919 - - - - 13.5:1 High-Compression x 97 2.0 - - - 60.1 WR450F 03-06,YZ450F 03-05 95 449 95 STD - 0910-0373 - CW18 - - 12.5:1 Standard Compression x Nikasil Bore - Cylinder sleeving or replating required for oversizes. 63 WR450F 07-15,YZ450F 06-09 95 449 95 STD 0903-0564 0910-0373 - CW18 - - 12.5:1 Standard Compression x ArmorGlide skirt coated. 63 Nikasil Bore - Cylinder sleeving or replating required for oversizes. WR450F 16-18,YZ450F 14-17,YZ450FX 16-18 97 449 97 STD 0903-1144 0910-3910 - CW18 - - 12.5:1 Stock Compression x ArmorGlide skirt coated. Nikasil Bore. 60.8 WR450F/YZ450FX 21-23,YZ450F 20-22 97 450 97 STD - 0910-6932 - - - - 13.0:1 Stock Compression x 60.9 WR450F/YZ450FX 21-23,YZ450F 20-22 97 450 97 STD - 0910-6933 - - - - 13.5:1 Stock Compression x 60.9 WR450F/YZ450FX 21-23,YZ450F 20-22 97 450 97 STD - 0910-6932 - - - - 13.0:1 Stock Compression x 60.9 WR450F/YZ450FX 21-23,YZ450F 20-22 97 450 97 STD - 0910-6933 - - - - 13.5:1 Stock Compression x 60.9 HIGH-PERFORMANCE PISTONS (CONT)
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