BOLD MAGENTA part numbers are new for 2026 PARTS-UNLIMITED.COM 2026 | OFFROAD PISTON & PISTON KITS PISTON & PISTON KITS 1420 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 # YAMAHA 2-STROKE (CONT) YZ125 97-04 54 125 54 STD - 765M05400 2126CS CW15 - B10384 GP Style. x 134 56 2.0 - - 2205CS - - B10015 Electra coated. 54.5 No intake window. Pinned on centerline. Longer skirt than stock. YZ125 05-21 54 125 54 STD 0903-0724 0910-0571 2126CS CW15 - B1001 YZ125X 20-22 x 134 56 2.0 0903-1160 0910-0572 2205CS Pro-Lite. 54.5 YZ125 05-21,YZ125X 20-22 54 125 54 STD 0903-0513 0910-0799 2126CS CW15 - B1001 Racer’s Choice GP Style. x 134 56 2.0 0903-0681 0910-0800 2205CS CSA Ring is Titanium Nitride coated. 54.5 144 58 4.0 0903-0682 0910-1255 2284CS Electra coated.ArmorGlide skirt coated. Crankcase clearance required for 57 mm and larger bore diameter. YZ125 22-25,YZ125X 23-25 54 124 54 STD - 0910-6456 2126CS CW15 - - Pro-Lite. x 134 56 2.0 - - 2205CS 54.5 125 58 4.0 - 0910-6914 - - YZ125 22-25,YZ125X 23-25 54 124 54 STD - 0910-6458 2126CS CW15 - - Racer’s Choice GP Style. x 125 56 2.0 - 0910-6915 - 54.5 125 58 4.0 - 0910-6916 - CT-2/-3 175 thru 77, DT175 79-81, MX175 79-82 66 172 66 STD - 471M06600 2598CD CW16 - B1021 x 66.5 0.5 - 471M06650 2618CD 50 67 1.0 - 471M06700 2638CD 67.5 1.5 - - 2658CD IT/YZ175 76-81 66 172 66 STD - - 2598CD CW16 - B1021 x 66.5 0.5 - 374M06650 2618CD 50 67 1.0 - 374M06700 2638CD 67.5 1.5 - - 2658CD 68 2.0 - - 2677CD RT180 90-98 64.5 176 64.5 STD - 0910-2875 2539CD CW16 S-486 - x 0.5 - - 2559CD 54 1.0 - 0910-2877 2579CD IT200 84-86 66 195 66 STD - 522M06600 2598CD CW16 - B1005 x 66.5 0.5 - - 2618CD 57 67 1.0 - 522M06700 2638CD 67.5 1.5 - - 2658CD 68 2.0 - - 2677CD DT250 74-79, IT250 78-80, MX250 73-75,YZ250 76-79 70 246 70 STD - 234M07000 2756CD CW18 - B1003 x 70.5 0.5 - 234M07050 2776CD 64 71 1.0 - 234M07100 2795CD 71.5 1.5 - - 2815CD 72 2.0 - 234M07200 2835CD IT250 81-82,YZ250 80-82 70 246 70 STD - 452M07000 2756CD CW18 - B10036 x 70.5 0.5 - - 2776CD B10147 64 70.75 0.75 - - 2786CD 71 1.0 - 452M07100 2795CD 71.5 1.5 - 452M07150 2815CD 72 2.0 - 452M07200 2835CD IT250 83 68 246.8 68 STD - 515M06800 2677CD CW18 - B1014 Pro-Lite. x 68.25 0.25 - - 2687CD 68 68.5 0.5 - 515M06850 2697CD 69 1.0 - 515M06900 2717CD 69.5 1.5 - - 2736CD 70 2.0 - - 2756CD WR250 91,YZ250 88-91 68 246.8 68 STD - 605M06800 2677CD CW18 S-508 B1014 Power Valve must be modified for 0.040 and larger. x 68 68.5 69 69.5 70 0.5 1.0 1.5 2.0 - - - - 605M06850 605M06900 605M06950 605M07000 2697CD 2717CD 2736CD 2756CD Pro-Lite. *1991 model is Ceramic - Composite Cylinder sleeving or replating required for oversizes. WR/YZ250 92-94 68 246.8 68 STD 0903-0716 677M06800 2677CD CW18 S-508 B1014 Ceramic Composite - Cylinder sleeving or replating required for oversizes. Pro-Lite. x 68.5 0.5 - 677M06850 2697CD 68 69 1.0 - 677M06900 2717CD 70 2.0 - - 2756CD WR/YZ250 95-98 68 246.8 68 STD 0903-0720 677M06800 2677CD CW18 S-508 B1014 Ceramic Composite - Cylinder sleeving or replating required for oversizes. Pro-Lite. x 68.5 0.5 - 677M06850 2697CD 68 69 1.0 0903-0722 677M06900 2717CD 70 2.0 - - 2756CD HIGH-PERFORMANCE PISTONS (CONT) 4 For 97-00 models. 5 For 01-04 models. 6 For IT250 81-82,YZ250 80-81. 7 For YZ250 82.
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