The Athena Big Bore Cylinder Kit is designed to provide a performance-focused replacement and upgrade for select Honda motocross and off-road motorcycles. Featuring an 85 mm bore and a 13.7:1 compression ratio, this kit increases engine displacement while supporting strong throttle response and dependable operation. It is identified by Athena manufacturer part number P400210100067 and is engineered for compatibility with the listed Honda applications.
This cylinder kit fits the 2018–2023 Honda CRF250R, including 2018, 2019, 2020, 2021, 2022, and 2023 models. It also fits the 2019–2022 Honda CRF250RX, including 2019, 2020, 2021, and 2022 models. Verify the motorcycle model year and engine configuration before installation to ensure proper application. The kit is intended for riders, technicians, and engine builders seeking a precisely matched Athena cylinder solution for compatible Honda engines.
Brand: Athena
Manufacturer Part Number: P400210100067
Vendor Part Number: P400210100067
Fitment: 2018–2023 Honda CRF250R; 2019–2022 Honda CRF250RX
Features:
- 85 mm big bore cylinder design supports increased engine displacement
- 13.7:1 compression ratio is engineered for performance-oriented engine builds
- Athena cylinder kit provides a precision replacement solution for compatible Honda motorcycles
- Fits 2018–2023 Honda CRF250R models
- Fits 2019–2022 Honda CRF250RX models
- Manufacturer and vendor part number: P400210100067
Fitment:
2018 Honda CRF250R
2019 Honda CRF250R
2019 Honda CRF250RX
2020 Honda CRF250R
2020 Honda CRF250RX
2021 Honda CRF250R
2021 Honda CRF250RX
2022 Honda CRF250R
2022 Honda CRF250RX
2023 Honda CRF250R
2023 Honda CRF250RX
2024 Honda CRF250R
2024 Honda CRF250RX