BOLD MAGENTA part numbers are new for 2023 PISTON & PISTON KITS PARTS-UNLIMITED.COM OFFROAD | 2023 1145 HIGH-PERFORMANCE PISTONS (CONT) HIGH-PERFORMANCE PISTONS continued on next page. 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 # HONDA MOTORCYCLE 4-STROKE (Correct replacement ring style is stamped on dome of piston – Example “C” for XC,“G” for XG and “H” for XH) (CONT) CRF250R 04-09 78 276 82 4.00 - 0910-2938 - CW16 0913-0008 - 13.5:1 Compression x 276cc Big Bore Kit 52.2 ArmorGlide skirt coated CRF250R 08-09 78 249 78.0 STD - 0910-1677 0912-0120 CW16 0913-0008 - 13.1:1 Stock-Compression x ArmorGlide skirt coated 52.2 CRF250R 08-09 78 249 78.0 STD - 0910-2931 0912-0120 CW16 0913-0008 - 13.6:1 High-Compression x ArmorGlide skirt coated 52.2 CRF250R 10-13 76.8 249 76.8 STD 0903-0940 0910-2886 - CW16 0913-0008 - 13.2:1 Stock Compression x ArmorGlide skirt coated 53.8 CRF250R 14-15 76.8 - 76.8 STD 0903-1137 - - CW16 0913-0008 - 13.5:1 Stock Compression x 53.8 XL250 79-82 74 248 74.0 STD - - 2913XC CW19 S-376 - XR250 thru 83 x 74.5 0.5 - - 2933XC 10:1 Compression 57.8 75.0 1.0 - 4171M07500 2953XC 75.5 1.5 - - 2973XC 76.0 2.0 - - 2992XC XR250R 84-85 75 250 75.0 STD - - 2953XG CW17 S-523 - XL250R 84-87 Radial Head x 75.5 0.5 - 4329M07550 2973XG 56.5 76.0 1.0 - 4329M07600 2992XG XR250R 86-04 73 250 73.0 STD 0903-0265 4466M07300 2874XC CW17 S-5233 - 10.5:1 Compression; x 73.5 0.5 0903-0216 4466M07350 2894XC cylinder boring 59.5 74.0 1.0 0903-0193 4466M07400 2913XC required for oversizes 75.5 2.5 - 0910-0753 2973XC 77.0 4.0 0903-0570 0910-0754 0912-0118 78.0 5.0 0903-0571 0910-0755 0912-0119 XR250L 91-96 73 250 73.0 STD - 4466M07300 2874XC CW17 S-5233 - 10.5:1 Compression; cylinder boring required for oversizes x 73.5 0.5 - 4466M07350 2894XC 59.5 74.0 1.0 - 4466M07400 2913XC 75.5 2.5 - 0910-0753 2973XC 77.0 4.0 - 0910-0754 0912-0118 78.0 5.0 - 0910-0755 0912-0119 XR350R 1983-84 84 339 84.0 STD - - 3307XC CW21 S-529 - Radial Head x 84.5 0.5 - - - 10:1 Compression 61.3 85.0 1.0 - 4286M08500 3347XC *Will not fit XL models XR400R 96-04 85 397 85.0 STD - 4606M08500 3347XC CW20 S-520 - 10:1 Compression x 86.0 1.0 - 4606M08600 3386XC 70 87.0 2.0 - 0910-2910 3425XC 88.0 3.0 - 0910-2911 3465XC XR400R 96-04 85 397 85.0 STD - 4628M08500 3347XC CW20 S-520 - 11:1 Hi-Compression x 86.0 1.0 - 0910-2913 3386XC 70 87.0 2.0 - 0910-2914 3425XC 88.0 3.0 - 0910-2915 3465XC XR400R 96-04 89 440 89.0 4.0 - 0910-0757 - CW20 S-520 - 440 Overbore x 12.5:1 Hi-Compression. Cylinder sleeving required 70 CRF450R 02-03 96 449 96.0 STD - 4753M09600 0912-0122 CW19 0913-0009 - 11.5:1 Standard Compression x ArmorGlide skirt coated 62.1 CRF450R 02-08 96 449 96.0 STD 0903-0567 0910-0334 0912-0122 CW19 0913-0009 - 12:1 Compression (std. for 04) x ArmorGlide skirt coated 62.1 CRF450R 02-08 96 449 96.0 STD 0903-0552 4755M09600 0912-0122 CW19 0913-0009 - 12.5:1 Hi-Compression. x ArmorGlide skirt coated. 62.1 Cylinder boring and plating required for oversizes CRF450R 02-08 96 449 96.0 STD 0903-0557 0910-0335 0912-0122 CW19 0913-0009 - 13:1 Hi-Compression. x ArmorGlide skirt coated 62.1 CRF450R 02-08 96 449 96.0 STD 0903-0572 0910-0758 0912-0122 CW19 0913-0009 - 13:5 Hi-Compression. x ArmorGlide skirt coated 62.1 3 (77-78mm).
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