Honda XLR125 56.50mm Standard Piston, Ring & Gasket Kit
Aftermarket top-end piston service kit for Honda XLR125 engines using Honda's KGA-B00 13mm-pin piston family.
Verified Fitment
Honda XLR125 kick-start 2003 variants assigned the 13101-KGA-B00 piston in Honda's part-assignment catalogue. Verify the KGA-B00 piston reference because other XLR125 generations use different piston families.
Kit Contents
- 1 × standard-size piston
- 1 × piston ring set
- 1 × 13mm gudgeon / wrist pin
- 2 × piston-pin circlips
- 1 × cylinder-head gasket
- 1 × cylinder-base gasket
- 2 × valve-stem seals
The matching Honda KGA-B00 piston family is a 56.50mm standard-bore design with a 13mm piston pin. Compare the piston crown, pin diameter and gasket shapes with the original engine parts before assembly.
Detailed Product Description
Standard-bore top-end piston service kit for compatible Honda 125cc four-stroke engines using the KGA-B00 13mm-pin piston family. It is intended for engine rebuilds where the cylinder remains at standard bore and the original piston, rings or top-end sealing components are worn or damaged.
The piston and rings should only be installed after the cylinder bore has been measured for diameter, taper, ovality and surface condition. A standard-size piston kit will not correct an excessively worn, scored or previously rebored cylinder.
Important Fitment Checks
- Confirm the engine uses Honda piston reference 13101-KGA-B00 or an equivalent 56.50mm / 13mm-pin specification.
- Measure the gudgeon pin: this kit uses a 13mm pin.
- Confirm the cylinder is standard bore and suitable for a 56.50mm piston.
- Compare piston crown profile, skirt cut-outs and ring-groove arrangement.
- Check head and base gasket shapes against the engine before assembly.
- Check piston-to-bore clearance and ring end gaps to the engine manufacturer's specifications.
Installation Notes
Clean the cylinder and ring grooves thoroughly before assembly. Fit the piston rings in their correct positions and orientation, stagger ring gaps as specified by the engine manufacturer, lubricate the piston and bore with clean engine oil, and fit new circlips securely into their grooves. Incorrect ring or circlip installation can cause serious engine damage.
Delivery & Returns
- Free UK delivery with an estimated 2–3 working-day service
- 30-day returns, subject to the item being returned unused and in its original condition
Honda OE Cross-References
This Moto Mania kit is supplied as unbranded aftermarket. Honda part numbers are included as identification and fitment cross-references and are not claimed to be the manufacturer MPN of the supplied kit.
- 13101-KGA-B00 – Honda standard piston
- 13011-KGA-B00 – Honda standard piston ring set
- 13111-KGA-B00 – Honda piston pin
- 13115-GN5-910 – Honda 13mm piston-pin circlip
- 12191-KGA-900 – Honda cylinder-base gasket
- 12251-KY0-891 – Honda cylinder-head gasket
Aftermarket Manufacturer Cross-References
- Mitaka 01.1202 – 56.50mm KGA-B00 / 13mm-pin piston-kit reference
- TKRJ AH0770X / PH0830X – standard 56.50mm piston-kit / piston reference for Honda 13101-KGA-B00
These branded references are supplied for comparison only. The Moto Mania kit itself is not represented as Mitaka or TKRJ branded.