BOLD MAGENTA part numbers are new for 2024 ENGINE PARTSCANADA .COM OFFROAD | 2024 645 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) HIGH-PERFORMANCE PISTONS continued on next page. 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 98-01 54 124 54.0 STD - 726M05400 - CW15 - - Pro-Lite x *Ceramic Composite - Cylinder 54.5 sleeving or replating required for oversizes YZ125 01 54 124 54.0 STD - 726M05400 - CW15 - B1001 Pro-Lite x *Ceramic Composite - Cylinder 54.5 sleeving or replating required for oversizes YZ125 02-04 54 125 54.0 STD - 797M05400 - CW15 - B1001 Pro-Lite x 54.5 YZ125 05-21,YZ125X 22 54 125 54.0 STD - 0910-0799 - CW15 - B1001 Racer’s Choice GP Style x 144 58.0 4.0 - 0910-1255 - Electra Coated 54.5 *Crankcase clearance required for 57mm and larger bore diameter* YZ125 22-24,YZ125X 23-24 54 125 54.0 STD - 0910-6456 - - - - Pro-Lite x 56.0 2.0 - 0910-6457 - 54.5 - YZ125 22 54 125 54.0 ST - 0910-6458 - - - - Racer’s Choice GP Style x 54.5 YZ250 83-87 68 246.8 68.0 STD - - - CW18 - B1014 Pro-Lite x 68 YZ250 88-91 68 246.8 68.0 STD - - - CW18 S-508 B1014 WR250 88-91 x Pro-Lite 68 YZ250 92-98 68 246.8 68.0 STD - 677M06800 - CW18 S-508 B1014 WR250 92-98 x *Ceramic Composite. Pro-Lite 68 YZ250 09-24,YZ250X 16-24 66.4 249 66.4 STD - 804M06640 - CW18 S-508 B1003 Pro-Lite x - Cylinder sleeving or 72 replating required for oversizes YZ250 99-24,YZ250X 16-24 66.4 249.3 66.4 STD - 0910-0367 - CW18 S-508 B1003 250cc Racer’s Choice Single Ring x Electra Coated 72 YZ490 82-83 87 487 87.5 0.5 - - - CW18 - B1014 IT490 83-84 x 82 YZ490 84-90 87 487 88.5 1.5 - - - CW18 - B1014 WR500 91-93 x 82 YAMAHA 4-STROKE TTR250 99-06 73 249 73.0 STD - - - CW18 - - 10.5:1 Compression x 59.6 YZ250F 05-07 77 250 77.0 STD - 0910-0808 0912-0140 CW16 - - WR250F 05-13 x 12.5:1 Compression 53.6 Nikasil Bore YZ250F 08-11 77 250 77.0 STD - 0910-1678 - CW16 - - ArmorGlide x Nikasil Bore 53.6 YZ250F 12-13 77 250 77.0 STD 0903-1146 - - - - - 13.5:1 Stock Compression x Nikasil bore 53.6 YZ250F 12-13 77 250 77.0 STD 0903-1147 - - - - - 14:1 High Compression x Nikasil bore 53.6
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