This complete top-end cylinder kit is designed for Honda XR250 (1986-2004), XR250R/L, and XL250 (1986-1996) 249cc 4-stroke single-cylinder engines. The OEM standard cylinder bore is 73.0mm . Precision dimensions: piston diameter 73.0mm (standard bore), piston rings 73mm set (2 compression rings + 1 oil ring), piston pin 17mm . The kit includes: 73mm cylinder block (aluminum alloy), 73mm piston, piston rings, 17mm wrist pin, circlips, and full top-end gasket set (cylinder head gasket, base gasket, valve stem seals). Replaces OEM part numbers: Piston 13101-KCE-670, Ring Set 13011-KCZ-305, Pin 13111-KK0-000. Oversize options available: 73.25mm (+0.25), 73.50mm (+0.50), 73.75mm (+0.75), 74.00mm (+1.00) for worn cylinder reconditioning. For 1984-1985 models (75mm bore, 267cc), this 73mm kit does NOT fit. Professional installation recommended for complete top-end rebuild — proper piston ring gap and torque specs required. Ideal for restoring lost compression, eliminating blow-by, reducing oil consumption, and refreshing top-end performance on XR250/XL250 engines. Perfect for off-road riding, dual-sport use, and engine rebuilding.
