BOLD MAGENTA part numbers are new for 2025 PARTS-UNLIMITED.COM 2025 | ATV/UTV PISTON & PISTON KITS PISTON & PISTON KITS 1072 HIGH-PERFORMANCE PISTONS (CONT) FITS MODEL STOCK BORE X STROKE (MM) BORE SIZE (MM) OVERIZE (MM) DISPLACEMENT (CC) COMPRESSION RATIO PISTON PART # PK KIT PART # RING SET PART # CIRCLIP PART # WRIST PIN PART # TOP-END BEARING PART # HONDA (4-STROKE) (CONT) ATC200/TRX200 81-85 65 x 57.8 65.0 STD 191.8 12:1 4289M06500 - 2559XC CW15 S-522 - ATC200S 81-86 65.5 0.50 4289M06550 - 2579XC *Race part only 66.0 1.00 4289M06600 - 2598XC 67.0 2.00 - - 2638XC ATC200X/TRX200SX 86-88 65 x 60 65.0 STD 199 10.25:1 - - 2559XC CW15 S-522 - Fat Cat 200 86-87 65.5 0.50 4394M06550 - 2579XC 66.0 1.00 - - 2598XC TRX250X 87-92 4-Valve 74 x 57.3 74.0 STD 246 12:1 4440M07400 0903-0491 2913XC CW17 S-523 - 74.5 0.50 4440M07450 - 2933XC 75.0 1.00 4440M07500 0903-0505 2953XC 76.0 2.00 0910-2829 - 2992XC TRX250EX 01-08 68.5 x 62.2 68.5 STD 229 10.5:1 0910-0856 - - CW15 - - 69.0 0.50 0910-0857 - TRX250 TE/TM/X Recon 02-23 68.5 x 62.2 68.5 STD 229 10:1 0910-2825 - - CW15 - - ArmorGlide skirt coated 69.0 0.50 0910-2826 - - 69.5 1.00 0910-4153 - - TRX300 2WD/4WD 88-00 74 x 65.5 74.0 STD 282 10.25:1 4629M07400 0903-0318 2913XC CW17 S-523 - 2-Valve 74.5 0.50 4629M07450 0903-0329 2933XC 75.0 1.00 4629M07500 - 2953XC 75.5 1.50 - 0903-0330 2973XC 76.0 2.00 - - 2992XC TRX300EX 92-08 74 x 65.5 74.0 STD 282 11:1 4574M07400 0903-0334 2913XC CW17 S-523 - 4-Valve 74.5 0.50 4574M07450 0903-0348 2933XC 75.0 1.00 - - 2953XC 75.5 1.50 - - 2973XC 76.0 2.00 0910-0378 0903-0313 - ATC350X/TRX350 Foreman 85-89 81 x 68 81.0 STD 350.4 10.25:1 4393M08100 0903-0317 3189XG CW21 S-529 - 81.5 0.50 4393M08150 0903-0328 3208XG 82.0 1.00 4393M08200 0903-0323 3228XG ATC350X/TRX350 Foreman 85-89 81 x 68 81.0 STD 350.4 12:1 - - 3189XG CW21 S-529 - 81.5 0.50 - - 3208XG 82.0 1.00 - - 3228XG TRX350 Rancher 00-06 78.5 x 68 78.5 STD 325 8.5:1 0910-0854 - - CW17 - - 79.0 0.50 0910-0855 0903-0634 - 79.5 1.00 0910-2850 - - TRX400EX 99-08/TRX400X 09-14 85 x 70 85.0 STD 397 10:1 4606M08500 0903-0345 3347XC CW20 - - 85.5 0.50 0910-2830 0903-0476 - 86.0 1.00 4606M08600 0903-0374 3386XC 87.0 2.00 - 0903-0483 3425XC 88.0 3.00 - 0903-0484 3465XC TRX400EX 99-08/TRX400X 09-14 85 x 70 85.0 STD 397 11:1 4628M08500 0903-0353 3347XC CW20 - - 85.5 0.50 0910-2831 0903-0475 - 86.0 1.00 - 0903-0471 3386XC 87.0 2.00 - 0903-0473 3425XC 88.0 3.00 - 0903-0485 3465XC TRX400EX 99-08/TRX400X 09-14 89 x 70 89.0 4.00 440 11:1 4667M08900 0903-0354 3504XC CW20 S553 - Cylinder sleeving and boring required, order PART #0931-0054 (88 mm sleeve) TRX400 Foreman 4x4 95-03 86 x 68 86.0 STD 394.9 8.2:1 - - 3386XC - - - 87.0 1.00 - - 3425XC TRX420 Rancher 07-24 86.5 x 71.5 86.5 STD 420 Stock 0910-2820 - - - - - ArmorGlide skirt coated 87.0 0.50 0910-2821 - - TRX450 Foreman ES/S 4x4 98-04 90 x 68 90.0 STD 432 9.5:1 0910-2833 - 3544XC - - - 90.5 0.50 - 0903-0649 - 91.0 1.00 - 0903-0650 - 92.0 2.00 - 0903-0652 - TRX450R 04-05 94 x 64.8 94.0 STD 450 10.5:1 0910-0665 0903-0477 - - - - ArmorGlide skirt coated TRX450R 04-05 94 x 64.8 94.0 STD 450 11.5:1 0910-0666 0903-0472 - CW21 - - ArmorGlide skirt coated TRX450R 04-05 94 x 64.8 94.0 STD 450 13.1:1 0910-0668 0903-0486 - - - - ArmorGlide skirt coated, Gas Ported TRX450R 04-05 94 x 64.8 98.0 5.00 489 12.5:1 0910-2839 - - CW21 - - ArmorGlide skirt coated *Kit included pistons, rings, piston pins,retainer clips, gasket. Sleeve or big-bore cylinder required TRX450R/ER 06-14 96 x 64.8 96.0 STD 450 12:1 0910-2844 0903-0479 - CW21 - - ArmorGlide skirt coated
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