BOLD MAGENTA part numbers are new for 2024 PARTS-UNLIMITED.COM 2024 | OFFROAD PISTON & PISTON KITS PISTON KITS (CONT) 1370 FITS MODEL BORE SIZE (MM) PISTON SIZE (MM) OVERSIZE PISTON KIT PART # SUG. RETAIL REPLACEMENT RING SET PART # SUG. RETAIL YAMAHA (CONT) WR250 91 68.00 67.94 STD 0910-55472 $150.95 - - 68.50 68.44 +.50 0910-55482 150.95 - - 69.00 68.94 +1.00 0910-55492 180.95 - - 69.50 69.44 +1.50 0910-55502 180.95 - - 70.00 69.94 +2.00 0910-55512 150.95 - - WR250 92-97 68.00 67.94 STD 0910-47342 150.95 - - 68.01 67.95 +.01 0910-47352 150.95 - - 68.02 67.96 +.02 0910-47362 150.95 - - WR250F 01-13 77.00 76.96 STD 0910-49254 182.95 - - 77.01 76.97 +.01 0910-49264 182.95 - - WR250F 18-19 77.00 76.95 STD 0910-52973, 4, 7 182.95 0912-0755 $49.95 77.01 76.96 +.01 0910-52983, 4, 7 182.95 0912-0755 49.95 YZ250 76-79 70.80 70.44 +.50 0910-55702, 11 150.95 - - 72.00 71.94 +2.00 0910-55712, 11 175.95 - - YZ250 88-91 68.00 67.94 STD 0910-55472 150.95 - - 68.50 68.44 +.50 0910-55482 150.95 - - 69.00 68.94 +1.00 0910-55492 180.95 - - 69.50 69.44 +1.50 0910-55502 180.95 - - 70.00 69.94 +2.00 0910-55512 150.95 - - YZ250 92-98 68.00 67.94 STD 0910-47342 150.95 - - 68.01 67.95 +.01 0910-47352 150.95 - - 68.02 67.96 +.02 0910-47362 150.95 - - YZ250 99-23 66.40 66.35 STD 0910-6641 183.60 - - 66.40 66.35 STD 0910-48772 144.95 - - 66.41 66.36 +.01 0910-6642 183.60 - - 66.41 66.36 +.01 0910-48782 144.95 - - 66.42 66.37 +.02 0910-48792 144.95 - - 77.01 76.97 +.01 0910-49264 182.95 - - YZ250F 05-07 77.00 79.96 STD 0910-49474 182.95 - - YZ250F 08-13 77.00 76.96 STD 0910-49724 182.95 - - YZ250F 16-18 77.00 76.95 STD 0910-52973, 4, 7 182.95 0912-0755 49.95 77.01 76.96 +.01 0910-52983, 4, 7 182.95 0912-0755 49.95 YZ250F 19-23 77.00 76.95 STD 0910-61383, 4, 6 183.95 0912-0755 49.95 77.01 76.96 +.01 0910-61393, 4, 6 183.95 0912-0755 49.95 YZ250FX 17-19 77.00 76.95 STD 0910-52973, 4, 7 182.95 0912-0755 49.95 77.01 76.96 +.01 0910-52983, 4, 7 182.95 0912-0755 49.95 YZ250FX/WR250F 20-23 77.00 76.95 STD 0910-61383, 4, 6 183.95 0912-0755 49.95 77.01 76.96 +.01 0910-61393, 4, 6 183.95 0912-0755 49.95 YZ250X 16-23 66.40 66.35 STD 0910-6641 183.60 - - 66.40 66.35 STD 0910-48772 144.95 - - 66.41 66.36 +.01 0910-48782 144.95 - - 66.42 66.37 +.02 0910-48792 144.95 - - WR450F 03-15 95.00 94.96 STD 0910-61483 192.95 0912-0860 49.95 WR450F 16-18 97.01 96.97 +.01 0910-6162 198.95 0912-0862 49.95 WR450F 19-20 97.00 96.96 STD 0910-61373, 6 198.95 0912-0862 49.95 WR450F 21-23 97.00 96.96 STD 0910-61423, 4, 6 214.95 0912-0862 49.95 97.01 96.97 +.01 0910-61433, 4, 6 214.95 0912-0862 49.95 YZ250F 16-18 77.00 76.95 STD 0910-52973, 4, 7 182.95 0912-0755 49.95 YZ450F 03-04 95.00 94.96 STD 0910-61483 192.95 0912-0860 49.95 YZ450F 06-09 95.00 94.96 STD 0910-49503 198.95 0912-0860 49.95 95.01 94.97 +.01 0910-49513 198.95 0912-0860 49.95 95.02 94.98 +.02 0910-49523 198.95 0912-0860 49.95 YZ450F 10-13 97.00 96.96 STD 0910-61213 198.95 0912-0862 49.95 97.01 96.97 +.01 0910-61223 198.95 0912-0862 49.95 YZ450F 14-17 97.01 96.97 +.01 0910-6162 198.95 0912-0862 49.95 YZ450F 18-19 97.00 96.96 STD 0910-61373, 6 198.95 0912-0862 49.95 YZ450F 20-22 97.00 96.96 STD 0910-61423, 4, 6 214.95 0912-0862 49.95 97.01 96.97 +.01 0910-61433, 4, 6 214.95 0912-0862 49.95 YZ450FX 16-18 97.01 96.97 +.01 0910-6162 198.95 0912-0862 49.95 YZ450FX 19-20 97.00 96.96 STD 0910-61373, 6 198.95 0912-0862 49.95 YZ450FX 21-23 97.00 96.96 STD 0910-61423, 4, 6 214.95 0912-0862 49.95 97.01 96.97 +.01 0910-61433, 4, 6 214.95 0912-0862 49.95 1 Check piston clearance when using OEM crankshaft part number 7923001800 from 2016 (superceded to 79230018100). 2 Dual ring. 3 Two ring design. 4 Double bridge forging. 5 Gas ported. 6 3D crown. 7 PRO series. 8 U.S. Bore. 9 No intake window. 10 Pinning on C/L. 11 Intake window. 12 Pinning off C/L. 13 Includes exhaust oil holes.
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