BOLD MAGENTA part numbers are new for 2024 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2024 1345 HIGH PERFORMANCE PISTONS continued on next page. HIGH-PERFORMANCE PISTONS (CONT) 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) YZ80 85-87 48 82 48 STD - 520M04800 1890CS CW12 S538 - x 48.5 0.5 - 520M04850 1909CS 45.6 49 1.0 - 520M04900 1929CS 49.5 1.5 - 520M04950 1949CS 50 2.0 - 520M05000 - YZ80 88-92 48 82 48 STD - - 1890CS CW12 S538 - x 48.5 0.5 - - 1909CS 45.6 49 1.0 - 569M04900 1929CS 49.5 1.5 - 569M04950 1949CS 50 2.0 - 569M05000 - YZ80 93-01 47 82 47.0 STD 0903-0711 646M04700 1850CS CW14 S-517 B1012 Pro-Lite x 47.5 0.5 - 646M04750 1869CS *Ceramic Composite - Cylinder sleeving or 47.8 48.0 1.0 - - 1890CS replating required for oversizes 49.0 2.0 - 0910-2868 1929CS YZ80 93-01 52.5 103.5 52.5 5.5 0903-0213 0910-0366 - CW14 S-288 B1012 Racer’s Choice Supermini x *Ceramic Composite - Cylinder sleeving or 47.8 replating required for oversizes *Crankcase clearance required for 50mm and larger bore diameter YZ85 02-24 47.5 85 47.5 STD 0903-0299 805M04750 1869CS CW14 S-517 B1012 Pro-Lite x 48.0 0.5 - 0910-1246 1890CS *Ceramic Composite - Cylinder sleeving or 47.8 48.5 1.00 - - 1909CS replating required for oversizes 49.5 2.00 0903-0194 805M04950 1949CS YZ85 02-24 52.5 103.5 52.5 5.5 0903-0271 0910-0366 - CW14 S-288 B1012 Racer’s Choice Supermini x CSA Ring is Titanium Nitride coated 47.8 ArmorGlide skirt Coated *Ceramic Composite - Cylinder sleeving or replating required for oversizes *Crankcase clearance required for 50mm and larger bore diameter YZ85 02-24 52.5 103.5 52.5 5.5 - 0910-0366 - CW14 S-288 B1012 Racer’s Choice Supermini x CSA Ring is Titanium Nitride coated 47.8 ArmorGlide skirt Coated *Ceramic Composite - Cylinder sleeving or replating required for oversizes *Crankcase clearance required for 50mm and larger bore diameter LT100 52 98 52.0 STD - 235M05200 2047CD CW14 S-288 B1012 LT100-2/LT100-3 x 52.5 0.5 - - 2067CD MX100 45.6 53.0 1.0 - 235M05300 2087CD DT100 54.0 2.0 - - 2126CD RT100 90-00 52 97 52.0 STD - 0910-0795 2047CD CW14 S-288 B1012 x 52.5 0.50 - 0910-0796 2067CD 45.6 53.0 1.00 - 0910-0797 2087CD AT2 125 72-73/ AT3 125 72-73 56 123 56.0 STD - - 2205CD CW16 S-270 B1016 MX125 74-76 x 56.5 0.5 - 236M05650 2224CD IT125 80-81 50 57.0 1.0 - 236M05700 - DT125 73 and up 58.0 2.0 - - - YZ125 76-82 56 123 56.0 STD - 435M05600 2205CS CW16 S-270 B1016 x 56.25 0.25 - - - 50 56.5 0.5 - - 2224CS 56.75 0.75 - - - 57.0 1.0 - 435M05700 2244CS 57.5 1.5 - - 2264CS 58.0 2.0 - 435M05800 2284CS YZ125 86-88 56 123 56.0 STD - - 2205CS CW16 S-514 B1016 Pro-Lite x 56.25 0.25 - - - *Power Valve must be modified 50 56.5 0.5 - 559M05650 2224CS for .040 and larger 56.75 0.75 - - - 57.0 1.0 - 559M05700 2244CS 57.5 1.5 - 559M05750 2264CS 58.0 2.0 - - 2284CS YZ125 89 56 123 56.0 STD - 582M05600 2205CS CW16 S-270 B1016 Pro-Lite x 56.5 0.5 - - 2224CS *Ceramic Composite - Cylinder sleeving or 50 56.75 0.75 - - - replating required for oversizes 57.0 1.0 - - 2244CS YZ125 90-92 56 124 56.0 STD - 0910-1681 2205CS CW16 S-514 B1016 Pro-Lite x 57 1.0 - 0910-2867 2244CS *Ceramic Composite-Cylinder sleeving or 50.7 replating required for oversizes
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