BOLD MAGENTA part numbers are new for 2025 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2025 PISTON & PISTON KITS 1343 HIGH-PERFORMANCE PISTONS (CONT) HIGH-PERFORMANCE PISTONS continued on next page. 2 Piston pin not included. 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 # GASGAS 2-STROKE (CONT) EC 200 00-14 62.5 199 62.5 STD - 0910-2879 2461CD CW18 S-477 - EC 200R 14-17 x 65 EC 250 97-14 66.4 249 66.4 - 0910-0778 2614CD CW18 S-508 B1037 x STD 72 EC 250 97-14 66.4 249 66.4 STD - 824M06640 0912-0106 CW18 S-508 B1037 x 72 EC 250R 14-18, EC 250 97-14, 66.4 249 66.4 STD - - 2614CD CW18 S-508 - SM 250 97-08, MC 250 97-08 x 72 EC 250 21-23 66.4 249 66.40 STD - 0910-0778 2614CD CW18 S-508 B1037 Pro-Lite x Double Ring 72 EC 250 21-23 66.4 249 66.4 STD - 824M06640 0912-0106 CW18 S-508 B1037 Racer’s Choice 250cc Single Ring x Single Ring. Electra coated. 72 ArmorGlide skirt coated.Titanium nitride ring EC 300R 14-18, EC 300 00-14 72 293 72 STD - 0910-1699 2835CD CW18 S-508 - x 72 GASGAS 4-STROKE EC 250F 10-15 77 250 77.0 STD 0903-0559 0910-0808 - CW16 0913-0008 - 12.5:1 Compression x 263 79.0 2.00 - - 3110XG Nikasil Bore - Cylinder sleeving 53.6 or replating required for oversizes EC 250F 10-15 77 250 77.0 STD 0903-0558 - 0912-0140 CW16 0913-0008 - 13.5:1 Compression x 263 79.0 2.00 - - 3110XG ArmorGlide skirt coated 53.6 2 Ring. Race Only. Nikasil Bore - Cylinder sleeving or replating required for oversizes EC 250F 21-23 78 250 78 STD - 0910-3166 - - - - 13.8:1 Stock Compression x ArmorGlide skirt coated 52.3 Strutted forging EC 350F 21-24, EX 350F 21-24 88 350 88.0 - - - - CW18 - - 14.2:1 compression x ArmorGlide skirt coated 57.5 EC 450F 13-15 95 449 95.0 STD - 0910-0373 - CW18 - - 12.3:1 STD bore; 13.5:1 for +2.00 bore x Nikasil Bore - Cylinder sleeving or replating 63.4 required for oversizes.ArmorGlide skirt coated MC 450F/EX 450F 21-23 95 449 95.0 STD - 0910-6542 - - - - 12.75:1 Compression x ArmorGlide skirt coated 63.4 HONDA 2-STROKE CR80R 80-82 49.5 79.7 49.5 STD - - 1949CD CW12 S5382 - TC80 70-78 x 50.0 0.5 - 450M05000 1969CD 41.4 50.5 1.0 - - 1988CD 51.0 1.5 - - 2008CD CR80R 84 49.5 79.7 49.5 STD - - 1949CD CW12 S5382 - x 50.0 0.5 - - 1969CD 41.4 50.5 1.0 - - 1988CD 51.0 1.5 - - 2008CD CR80R 85 47 82.9 47.0 STD - - 1850CD CW13 - - x 47.5 0.5 - - 1869CD 47.8 48.0 1.0 - - - 48.5 1.5 - - 1909CD 49.0 2.0 - - 1929CD CR80R 86-91 47 82.9 47.0 STD - 643M04700 1850CS CW14 S-517 B1012 Pro-Lite x 47.5 0.5 - 643M04750 1869CS *Nikasil Bore – Cylinder sleeving 47.8 48.0 1.0 - 643M04800 1890CS or replating required for oversizes 49.0 2.0 - 0910-1221 1929CS CR80R 86-02 46 79.4 46 STD - - - CW14 S-517 B1012 Pro-Lite x International bore. Not available in the U.S. 47.8
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