BOLD MAGENTA part numbers are new for 2025 ENGINE PARTSCANADA .COM OFFROAD | 2025 ENGINE 727 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”. HIGH-PERFORMANCE PISTONS (CONT) FITS MODEL BORE (MM) X STROKE (MM) DISP. (CC) BORE SIZE (MM) OVERSIZES (MM) PK KIT PART # PISTON PART # REPL. RING SET PART # REPL. CIRCLIPS PART # (PR.) REPL. WRIST PIN PART # TOP-END BEARING PART # YAMAHA 2-STROKE (CONT) YZ250 99-24,YZ250X 16-24 250cc Racer’s Choice Single Ring Electra Coated 66.4 249.3 66.4 STD - 0910-0367 - CW18 S-508 B1003 x 72 YZ490 82-90, IT490 83-84, WR500 91-93 87 487 87.5 0.5 - - - CW18 - B1014 x 82 YAMAHA 4-STROKE TT-R250 99-06 10.5:1 Compression 73 249 73 STD - - - CW18 - - x 59.6 YZ250F 05-07, WR250F 05-13 12.5:1 Compression Nikasil Bore 77 250 77 STD - 0910-0808 0912-0140 CW16 - - x 53.6 YZ250F 08-11 ArmorGlide Nikasil Bore 77 250 77 STD - 0910-1678 - CW16 - - x 53.6 YZ250F 16-18,YZ250FX 17-19, WR250F 18-19 13.5:1 Compression.ArmorGlide Boxed forging 77 250 77 STD 0910-6072 - - CW18 - - x 53.6 YZ250F 16-18,YZ250FX 17-19, WR250F 18-19 14:1 Compression.ArmorGlide Boxed forging 77 250 77 STD 0910-6073 - - CW18 - - x 53.6 YZ450F 06-09, WR450F 07-15 12.5:1 Standard Compression. Nikasil Bore - cylinder sleeving or replating required for oversizes 95 449 95 STD - 0910-0373 - CW18 - - x 63 YZ450F 14-17,YZ450FX 16-18, WR450F 16-18 13.5:1 Compression.ArmorGlide Boxed forging 97 449 97 STD 0910-6069 - - CW18 - - x 60.8 YZ450F 18-19,YZ450FX 19-20, WR450F 19-20 12.8:1 Compression.ArmorGlide Boxed forging 97 449 97 STD 0910-6083 - - CW18 - - x 60.8 TOP-END BEARING DIMENSIONS DIMENSIONS (MM) PART # 12 x 16 x 17.8 0924-0125 16 x 20 x 19.5 978835 15 x 19 x 17 B1001 18 x 22 x 22 B1003 20 x 25 x 27.8 B1004 DIMENSIONS (MM) PART # 14 x 18 x 17.5 B1006 16 x 21 x 19.5 B1008 14 x 18 x 16 B1012 15 x 19 x 20 B1013 18 x 23 x 22 B1014 DIMENSIONS (MM) PART # 16 x 20 x 19.5 B1016 14 x 18 x 20 B1018 18 x 22 x 23.6 B1022X 22 x 27 x 24.8 B1030 20 x 25 x 23 B1031 DIMENSIONS (MM) PART # 18 x 22 x 19.65 B1037 12 x 15 x 14.5 B1041 12 x 15 x 16.3 B1042 REPLACEMENT CIRCLIPS DIMENSIONS DESCRIPTION PART # 14 mm circlips CW14 DESCRIPTION PART # 15 mm circlips CW15 DESCRIPTION PART # 16 mm circlips CW16 DESCRIPTION PART # 18 mm circlips CW18 DESCRIPTION PART # 19 mm circlips CW19 DESCRIPTION PART # 20 mm circlips CW20 WRIST PIN DIMENSIONS OD/LENGTH PART # 19 mm x 45 mm x 10 mm 0913-0012 OD/LENGTH PART # 18 mm x 2.1062” S-508
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