BOLD MAGENTA part numbers are new for 2026 PARTSCANADA.COM 2026 | OFFROAD ENGINE ENGINE 754 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) YZ125 02-04 Pro-Lite. 54 125 54 STD - 797M05400 - CW15 - B1001 x 54.5 YZ125 05-21,YZ125X 20-22 Racer’s Choice GP Style. CSA Ring is Titanium Nitride coated. Electra coated.ArmorGlide skirt coated. Crankcase clearance required for 57 mm and larger bore diameter. 54 125 54 STD - 0910-0799 - CW15 - B1001 x 144 58 4.0 - 0910-1255 54.5 YZ125 22-25,YZ125X 23-25 Pro-Lite. 54 125 54 STD - 0910-6456 - - - - x 56 2.0 - 0910-6457 - 54.5 YZ125 22-25,YZ125X 23-25 Racer’s Choice GP Style. 54 125 54 ST - 0910-6458 - - - - x 54.5 WR250 92-98,YZ250 92-98 Ceramic Composite. Pro-Lite. 68 246.8 68 STD - 677M06800 - CW18 S-508 B1014 x 68 YZ250 09-25,YZ250X 16-25 Pro-Lite. 66.4 249 66.4 STD - 804M06640 - CW18 S-508 B1003 x 72 YZ250 99-25,YZ250X 16-25 250cc Racer’s Choice; Single ring. Electra coated.ArmorGlide skirt coated. 66.4 249.3 66.4 STD - 0910-0367 - CW18 S-508 B1003 x 72 IT490 83-84,YZ490 82-90,WR500 91-93 87 487 - - - - - CW18 - B1014 x 82 YAMAHA 4-STROKE TT-R250 99-06 10.5:1 Compression. 73 249 73 STD - - - CW18 - - x 59.6 WR250F 05-13,YZ250F 05-07 12.5:1 Compression. Nikasil Bore. 77 250 77 STD - 0910-0808 0912-0140 CW16 - - x 53.6 YZ250F 08-11 ArmorGlide skirt coated. Nikasil Bore. 77 250 77 STD - 0910-1678 - CW16 - - x 53.6 WR250F 18-19,YZ250F 16-18,YZ250FX 17-19 13.5:1 Compression. ArmorGlide skirt coated. Boxed forging. 77 250 77 STD 0910-6072 - - CW18 - - x 53.6 WR250F 18-19,YZ250F 16-18,YZ250FX 17-19 14:1 Compression. ArmorGlide skirt coated. Boxed forging. 77 250 77 STD 0910-6073 - - CW18 - - x 53.6 WR450F 07-15,YZ450F 06-09 12.5:1 Standard Compression. Nikasil Bore. 95 449 95 STD - 0910-0373 - CW18 - - x 63 WR450F 16-18,YZ450F 14-17,YZ450FX 16-18, 13.5:1 Compression. ArmorGlide skirt coated. Boxed forging. 97 449 97 STD 0910-6069 - - CW18 - - x 60.8 WR450F 19-20,YZ450F 18-19,YZ450FX 19-20, 12.8:1 Compression. ArmorGlide skirt coated. Boxed forging. 97 449 97 STD 0910-6083 - - CW18 - - x 60.8 TOP-END BEARING DIMENSIONS DIMENSIONS (MM) PART # 12 x 15 x 14.5 B1041 12 x 15 x 16.3 B1042 12 x 16 x 17.8 0924-0125 14 x 18 x 16 B1012 DIMENSIONS (MM) PART # 14 x 18 x 17.5 B1006 14 x 18 x 20 B1018 15 x 19 x 17 B1001 15 x 19 x 20 B1013 DIMENSIONS (MM) PART # 16 x 20 x 19.5 978835 16 x 20 x 19.5 B1016 16 x 21 x 19.5 B1008 18 x 22 x 19.65 B1037 DIMENSIONS (MM) PART # 18 x 22 x 22 B1003 18 x 22 x 23.6 B1022X 18 x 23 x 22 B1014 20 x 25 x 23 B1031 DIMENSIONS (MM) PART # 20 x 25 x 27.8 B1004 22 x 27 x 24.8 B1030 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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