Honda XR100 Piston Kit - Wiseco - Forged 54.50 mm Bore, 9.4:1 CR - '81–'03 is a direct-fit replacement piston kit for Honda XR100 models. This Wiseco forged piston kit supplies the essential components to rebuild or refresh the top end with a durable, performance-oriented piston package.

The kit features a forged piston designed for strength and service life under typical trail and street use. It is supplied as a complete package with wrist pin, rings, and circlips for straightforward installation. The 54.50 mm bore size and 9.4:1 compression ratio match the listed specification for XR100 engines, providing a reliable option for riders repairing or customizing their small-displacement four-stroke. Wiseco’s Forged Series is engineered to suit a variety of 4-stroke applications and this specific kit focuses on fitment and durability for the XR100 platform.

Features

• Forged piston construction for improved strength and durability
• Complete kit: piston, wrist pin, rings, and circlips included
• 54.50 mm bore with 9.4:1 compression ratio matching XR100 specifications
• Direct fit for Honda XR100 ('81–'03) to simplify replacement

If you have questions or want help confirming fitment, call us directly—our tech staff can assist with selection or ordering. We offer installation and customization services at both of our locations in Austin, Texas and the Los Angeles, California area. Call: 512-982-9393 (TX) or 562-981-6800 (CA). If you’re thinking about purchasing multiple items, contact us for shipping discounts. We install on premises at both locations.

CA Residents: WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov