BOLD MAGENTA part numbers are new for 2025 PARTS-UNLIMITED.COM 2025 | OFFROAD PISTON & PISTON KITS PISTON & PISTON KITS 1378 PISTON KITS (CONT) FITS MODEL BORE SIZE (MM) PISTON SIZE (MM) OVERSIZE PISTON KIT PART # REPLACEMENT RING SET PART # BETA (CONT) 200 RR 2T 19-23 62 61.95 STD 0910-66322 - 62.01 61.96 STD 0910-66332 - 62.02 61.97 STD 0910-66342 - 300 RR 2T 22-23 73 72.95 STD 0910-66292 - 73.01 72.96 0.01 0910-66302 - 73.02 72.97 0.02 0910-66312 - 300 Xtrainer 2T 22 73 72.95 STD 0910-66292 - 73.01 72.96 0.01 0910-66302 - 73.02 72.97 0.02 0910-66312 - 450 RR 4T 05-09 89.01 88.97 0.01 0910-49333 - 525 RR 4T 05-09 95 94.95 STD 0910-48953, 4 0912-0860 95.01 94.96 STD 0910-48963, 4 0912-0860 GASGAS MC 50 21-23 39.5 39.46 STD 0910-4899 - 39.51 39.47 0.01 0910-4900 - 39.52 39.48 0.02 0910-4901 - MC 65 21-23 45.02 44.96 STD 0910-4890 - 45.03 44.97 0.01 0910-4891 - 45.04 44.98 0.02 0910-4892 - MC 85 21-23 47 46.95 STD 0910-4847 - 47.01 46.96 0.01 0910-4848 - 47.02 46.97 0.02 0910-4849 - 47.02 46.97 0.02 0910-66252 - MC 125 21-23 54 53.95 STD 0910-4884 - 54 53.95 STD 0910-48692 - 54.01 53.96 0.01 0910-4885 - 54.01 53.96 0.01 0910-48702 - 54.02 53.97 0.02 0910-48712 - EC 250 21-23 66.4 66.34 STD 0910-48612 - 66.41 66.35 0.01 0910-48622 - 66.42 66.36 0.02 0910-48632 - EC 250F 10-15 77 76.96 STD 0910-49474 - EC 250F 21-23 78 77.96 STD 0910-49933, 4, 5 - MC/EX 250 22-23 66.4 66.34 STD 0910-48612 0912-0692 66.41 66.35 0.01 0910-48622 0912-0692 66.42 66.36 0.02 0910-48632 0912-0692 MC/EX 250F 21-23 78 77.96 STD 0910-61343, 4, 5, 6 0912-0692 78.01 77.97 0.01 0910-61353, 4, 5, 6 0912-0692 MC 250F 24 81 80.95 STD 0910-6835 - 81 80.95 STD 0910-68364 - EC/EX 300 21-23 72 71.94 STD 0910-66202 - 72.01 71.95 0.01 0910-66212 - 72.02 71.96 0.02 0910-66222 - EX 350F 21-23 88 87.95 STD 0910-49863 - 88.01 87.96 0.01 0910-49873 - 88.02 87.97 0.02 0910-49883 - MC 350F 22-23 88 87.95 STD 0910-49863 - 88.01 87.96 0.01 0910-49873 - 88.02 87.97 0.02 0910-49883 - MC 350F 24 88 87.95 STD 0910-6843 - EC 450F 13-15 95 94.96 STD 0910-49503 - 95.02 94.98 0.02 0910-49523 - EC 450F 24 95 94.95 STD 0910-6834 - MC/EX 450F 21-23 95 94.95 STD 0910-61243, 5 0912-0860 95 94.95 STD 0910-61253, 4, 5, 6, 7 0912-0860 95.01 94.96 0.01 0910-61263, 4, 5, 6, 7 0912-0860 MC 450F 24 95 94.95 STD 0910-6844 - 95 94.95 STD 0910-68455 - HONDA CR80R 92-02 47 46.95 STD 0910-55818 - CR85R 03-07 47.5 47.45 STD 0910-4835 - 47.51 47.46 0.01 0910-4836 - CR125M Elsinore 73-78 56 55.94 STD 0910-55542 - CR125R 80-84 55.5 55.44 STD 0910-55532 - CR125R 85-86 54 53.94 STD 0910-55422 - CR125R 87 54 53.94 STD 0910-4839 - CR125R 88-89 54 53.94 STD 0910-4838 - 2 Dual ring. 3 Two ring design. 4 Double bridge forging. 5 Gas ported. 6 3D crown. 7 PRO series. 8 U.S. Bore.
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