BOLD MAGENTA part numbers are new for 2025 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2025 PISTON & PISTON KITS 1365 HIGH-PERFORMANCE PISTONS (CONT) HIGH-PERFORMANCE PISTONS continued on next page. 6 For IT250 81-82,YZ250 80-81. 7 For YZ250 82. 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) RT180 90-98 64.5 176 64.5 STD - 0910-2875 2539CD CW16 S-486 - x 0.5 - 0910-2876 2559CD 54 1.0 - 0910-2877 2579CD IT200 84-86 66 195 66.0 STD - 522M06600 2598CD CW16 - B1005 x 66.5 0.5 - - 2618CD 57 67.0 1.0 - 522M06700 2638CD 67.5 1.5 - - 2658CD 68.0 2.0 - - 2677CD WR200 92-98 (Euro only) 66.8 199 66.8 STD - - 2628CD CW16 - - x 67.0 0.20 - - 2638CD 57 67.5 0.70 - - 2658CD 68.0 1.20 - - 2677CD YZ250 76-79 70 246 70.0 STD - 234M07000 2756CD CW18 - B1003 IT250 78-80 x 70.5 0.5 - 234M07050 2776CD DT250 74-79 64 71.0 1.0 - 234M07100 2795CD MX250 73-75 71.5 1.5 - - 2815CD 72.0 2.0 - 234M07200 2835CD YZ250 80-82 70 246 70.0 STD - 452M07000 2756CD CW18 - B10036 IT250 81-82 x 70.5 0.5 - - 2776CD - - B10147 64 70.75 0.75 - - 2786CD 71.0 1.0 - 452M07100 2795CD 71.5 1.5 - 452M07150 2815CD 72.0 2.0 - 452M07200 2835CD IT250 83 68 246.8 68.0 STD - 515M06800 2677CD CW18 - B1014 Pro-Lite x 68.25 0.25 - - 2687CD 68 68.5 0.5 - 515M06850 2697CD 69.0 1.0 - 515M06900 2717CD 69.5 1.5 - - 2736CD 70.0 2.0 - - 2756CD YZ250 83-87 68 246.8 68.0 STD - 560M06800 2677CD CW18 - B1014 Pro-Lite x 68.25 0.25 - - 2687CD *Power Valve must be modified 68 68.5 0.5 - 560M06850 2697CD for 0.040 and larger 69.0 1.0 - 560M06900 2717CD 69.5 1.5 - 560M06950 2736CD 70.0 2.0 - - 2756CD YZ250 88-91 68 246.8 68.0 STD - 605M06800 2677CD CW18 S-508 B1014 WR250 91 x 68.5 0.5 - 605M06850 2697CD Pro-Lite 68 69.0 1.0 - 605M06900 2717CD *Power Valve must be 69.5 1.5 - 605M06950 2736CD modified for 0.040 and larger 70.0 2.0 - 605M07000 2756CD *1991 model is Ceramic - Composite Cylinder sleeving or replating required for oversizes YZ250 92-94 68 246.8 68.0 STD 0903-0716 677M06800 2677CD CW18 S-508 B1014 WR250 92-94 x 68.5 0.5 - 677M06850 2697CD Pro-Lite 68 69.0 1.0 - 677M06900 2717CD *Ceramic Composite - 70.0 2.0 - - 2756CD Cylinder sleeving or replating required for oversizes YZ250 92-98 68 246.8 68.0 STD - 0910-1233 - CW18 S-508 B1014 Racer’s Choice x 250cc Single Ring 68 YZ250 95-98 68 246.8 68.0 STD 0903-0720 677M06800 2677CD CW18 S-508 B1014 WR250 95-98 x 68.5 0.5 - 677M06850 2697CD Pro-Lite 68 69.0 1.0 0903-0722 677M06900 2717CD *Ceramic Composite - Cylinder sleeving or 70.0 2.0 - - 2756CD replating required for oversizes YZ250 99-01 66.4 249 66.4 STD 0903-0921 804M06640 2614CD CW18 S-508 B1003 Pro-Lite x 67.0 0.6 - 0910-1244 2638CD *Ceramic Composite - Cylinder sleeving or 72 67.5 1.1 - 0910-1245 2658CD replating required for oversizes 68.5 2.10 - 0910-0207 2697CD YZ250 02-24,YZ250X 16-24 66.4 249 66.4 STD 0903-0308 804M06640 2614CD CW18 S-508 B1003 Pro-Lite x 67.0 0.6 - 0910-1244 2638CD *Ceramic Composite - Cylinder 72 67.5 1.1 - 0910-1245 2658CD sleeving or replating required 68.5 2.10 - 0910-0207 2697CD for oversizes
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