BOLD MAGENTA part numbers are new for 2024 PARTS-UNLIMITED.COM 2024 | OFFROAD PISTON & PISTON KITS 1348 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) YZ400 76-78 85 397 85.0 STD - - 3347TD CW18 S-277 B1003 IT400 76-78 x 85.5 0.5 - 394M08550 - 70 86.0 1.0 - - 3386TD 86.5 1.5 - 394M08650 3405TD 87.0 2.0 - - 3425TD YZ465 80-81 85 465 85.0 STD - - 3347TD CW18 S-277 B1014 IT465 81-82 X 85.5 0.5 - 451M08550 - 82 86.0 1.0 - - 3386TD 86.5 1.5 - 451M08650 3405TD 87.0 2.0 - - 3425TD YZ490 82-83 87 487 87.0 STD - 478M08700 3425TD CW18 S-277 B1014 IT490 83-84 x 87.5 0.5 - 478M08750 3445TD 82 88.0 1.0 - 478M08800 3465TD 88.5 1.5 - - 3484TD 89.0 2.0 - - 3504TD YZ490 84-90 87 487 87.0 STD - 546M08700 3425TD CW18 S-277 B1014 WR5091-93 x 87.5 0.5 - - 3445TD Pro-Lite 82 88.0 1.0 - 546M08800 3465TD 88.5 1.5 - 546M08850 3484TD 89.0 2.0 - 546M08900 3504TD YAMAHA 4-STROKE TTR90E 03-07 47 90 47.0 STD - 0910-0368 0912-0112 CW13 0913-0005 - 11:1 Hi-Compression x 92 47.5 0.50 - 0910-0369 0912-0113 Cylinder boring required 51.8 94 48.0 1.00 - - 0912-0114 for oversizes 110 52 .0 5.00 - - 0912-0111 TTR125/L 00-23 (all) 54 123.7 54.0 STD 0903-0742 4752M05400 - CW15 - - 11:1 Compression x 54.5 0.5 0903-0740 4752M05450 - 54 55.0 1.0 0903-0741 4752M05500 - TTR250 99-06 73 249 73.0 STD - - 2874XC CW18 - - 10.5:1 Compression x 73.5 0.5 - 4689M07350 2894XC 59.6 74.0 1.0 - 4689M07400 2913XC YZ250F/WR250F 01-04 77 249 77.0 STD 0903-0554 0910-0573 - CW16 0913-0008 - 12.7:1 Compression (0903-0554/0910-0573) x 262 79.0 2.0 - - 3110XG 13.2:1 Compression (0910-0574) 53.6 YZ250F 01-04 77 249 77.0 STD - 0910-0806 0912-0140 CW16 0913-0008 - 13.5:1 Compression x Light weight, 2-ring, gas ported 53.6 ArmorGlide skirt coated YZ250F 01-11 77 290 83.0 6.0 - 0910-2936 3268XG CW16 0913-0008 - WR250F 01-13 x 12.5:1 Compression 53.6 290cc Big Bore ArmorGlide skirt coated YZ250F 05-07 77 250 77.0 STD 0903-0559 0910-0808 - CW16 0913-0008 - WR250F 05-13 x 263 79.0 2.00 - - 3110XG 12.5:1 Compression 53.6 Nikasil Bore - Cylinder sleeving or replating required for oversizes YZ250F 05-07 77 250 77.0 STD 0903-0558 - 0912-0140 CW16 0913-0008 - WR250F 05-13 x 263 79.0 2.00 - - 3110XG 13.5:1 Compression 53.6 ArmorGlide skirt coated 2 Ring. Race Only. Nikasil Bore - Cylinder sleeving or replating required for oversizes YZ250F 08-11 77 250 77.0 STD 0903-0937 - - CW16 0913-0008 - 13.5:1 Stock Compression x 79.0 2.0 - - 3110XG ArmorGlide skirt coated 53.6 Nikasil Bore YZ250F 08-11 77 250 77.0 STD 0903-0938 - - CW16 0913-0008 - 14:1 High-Compression x ArmorGlide skirt coated 53.6 Nikasil Bore YZ250F 12-13 77 250 77 STD 0903-1146 - - - - - 13.5:1 Stock Compression x Nikasil bore 53.6 YZ250F 14-15 77 250 77 STD 0903-1143 - 0912-0140 CW16 - - YZ250FX 15-16 x WR250F 15-17 53.6 13.5:1 Stock Compression Nikasil bore
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