Wiseco Forged Series Piston Kit with Gaskets - Honda XR250R/XR250L (1986-2004) - 78.00mm Bore (+5.00mm Big Bore) - 4-Stroke
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Wiseco Forged Series Piston Kit with Gaskets - Honda XR250R/XR250L - +5.00mm Big Bore
Premium Wiseco Forged Series piston kit with complete gasket set for Honda XR250R and XR250L off-road/dual-sport bikes. This is a BIG BORE KIT (+5.00mm / 78.00mm) - the largest oversize available for this platform!
⚠️ Big Bore Kit - Cylinder Boring Required
This piston is +5.00mm oversize. Cylinder boring to 78.00mm is required for proper fit. Cylinder sleeves must be purchased separately if needed. Professional installation recommended.
Kit Includes
- +5.00mm Oversize Forged Series Piston
- Ring Set
- Wrist Pin
- Circlips
- Complete Gasket Set
Key Features
- Forged Series - premium 2618 aluminum alloy construction
- Maximum big bore kit for maximum displacement increase
- 10.5:1 compression ratio
- Complete top-end gasket kit included
- Dual model fitment - XR250R and XR250L
- 19 years of fitment (1986-2004)!
Ring Style Note
Correct replacement ring style is stamped on the dome of piston. Example: "C" for "XC", "G" for "XG" and "H" for "XH". Wiseco ring types are not interchangeable.
Piston Specifications
- Bore Size: 78.00 mm (+5.00mm Big Bore)
- Piston Diameter: 77.95 mm
- Stroke Length: 59.50 mm
- Compression Ratio: 10.5:1
- Material: 2618 Aluminum Alloy
- Skirt Coating: Non-Coated
Engine Specifications
- Displacement: 250cc (increased from stock)
- Engine Type: 4-Stroke
- Weight: 1.7 lbs
Fitment
- Honda XR250R: 1986-2004
- Honda XR250L: 1991-1996
📦 Shipping Information
In-stock items ship next business day. ModQuad parts dispatch Monday through Thursday.
Made-to-order and custom powder coat items show their lead time at the top of this page, right next to the truck icon. These are built fresh for you, so timing varies by brand and current backlog.
Need something by a specific date? Call us at 541-668-7503 before ordering and we will check stock and ETA on that exact part. We can often point you to an in-stock alternative from another distributor.
Questions? Contact us, we respond within 24 hours.
