BOLD MAGENTA part numbers are new for 2024 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2024 1349 HIGH PERFORMANCE PISTONS continued on next page. HIGH-PERFORMANCE PISTONS (CONT) 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) YZ250F 14-15 77 250 77 STD - - - CW16 - - YZ250FX 15-16 x WR250F 15-17 53.6 14:1 High Compression TT350 85-98 86 346 86.0 STD - 0910-2916 3386XC - - - XT350 85-00 x 87 1.0 - 0910-1661 3425XC 9:1 Compression 59.6 1.5 - 0910-2917 - Cylinder boring and replating required for oversizes YZ400F 98-99 92 399 92.0 STD - 4649M09200 - CW18 - - WR400F 98-00 x 12.5:1 Compression 60.1 -8cc Dome Volume YZ426F 00-02 95 426 95.0 STD - 4693M09500 - - - - WR426F 01-02 x 97.0 2.00 - 0910-2918 - 12.5:1 Stock Compression 60.1 YZ426F 00-02 95 426 95.0 STD - 0910-2919 - - - - WR426F 01-02 x 97.0 2.00 - - - 13.5:1 High Compression 60.1 YZ450F 03-05 95 449 95.0 STD 0903-0563 0910-0373 - CW18 - - WR450F 03-06 x 12.5:1 Standard Compression. Nikasil Bore - Cylinder 63 sleeving or replating required for oversizes YZ450F 06-09 95 449 95.0 STD 0903-0564 0910-0373 - CW18 - - WR450F 07-15 x 12.5:1 Standard Compression. Nikasil Bore - Cylinder sleeving or 63 replating required for oversizes. ArmorGlide skirt coated YZ450F 06-09 95 449 95.0 STD - - - CW18 - - WR450F 07-15 x 13.5:1 Hi-Compression. Nikasil Bore - cylinder 63.4 sleeving or replating required for oversizes. ArmorGlide skirt coated YZ450F 10-13 97 449 97 STD - 0910-2884 - CW18 - - 12.5:1 Stock Compression x Nikasil Bore - ArmorGlide skirt coated 60.8 YZ450F 10-13 97 449 97 STD - 0910-2885 - CW18 - - 13.5:1 High Compression x Nikasil Bore - ArmorGlide skirt coated 60.8 YZ450F 14-17,YZ450FX 16-18,WR450F 16-18 97 449 97 STD 0903-1144 0910-3910 - CW18 - - 12.5:1 Stock Compression x Nikasil Bore,ArmorGlide skirt coated 60.8 YZ450F 14-17,YZ450FX 16-18,WR450F 16-18 97 449 97 - - - - CW18 - - 13.5:1 High Compression x Nikasil Bore,ArmorGlide skirt coated 60.8 SR500 87 499 87.0 STD - 0910-2923 3425XC CW20 - - TT500 77-81 x 87.5 0.5 - 0910-1666 - XT500 76-81 84 88.0 1.0 - 0910-2924 3465XC 9:1 Stock Compression Cylinder boring required for oversizes SR500 87 499 87.0 STD - 0910-2899 3425XC CW20 - - TT500 77-81 x 87.5 0.5 - - - XT500 76-81 84 88.0 1.0 - - 3465XC 10:1 Compression 89.0 2.0 - - 3504XC Cylinder boring required for oversizes SR500 87 499 90.0 3.00 - 0910-2927 3544XC CW20 - - TT500 77-81 x XT500 76-81 84 3mm Big Bore Stock Compression 9:1 SR500 87 499 90.0 3.00 - 0910-2902 3544XC CW20 - - TT500 77-81 x XT500 76-81 84 3mm Big Bore 11:1 Compression XT600 84-96 95 598 95.0 STD - - 3740XH - - - 10.75:1 Compression x - - - - - - Crankcase clean-up required 84 - - - - - -
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