ATHENA P400210100074 Big Bore Cylinder Kit for Honda CRF 250 R 2022–2024, 85mm

Unleash the full potential of your machine with this massive 290cc displacement upgrade. Designed specifically for riders who crave explosive acceleration and relentless power, this complete bolt-on kit transforms your engine's performance from the bottom end all the way to the redline. By increasing your bore to a robust 85mm and pairing it with high-quality, precision-engineered components, you'll experience a dramatic boost in torque and overall horsepower. Whether you are chasing holeshots or tearing up the backcountry, this upgrade delivers race-proven durability and uncompromising performance to keep you ahead of the pack.

• Massive 290cc displacement upgrade

• 85mm precision-machined bore

• Optimized for aggressive torque and horsepower gains

• Includes plug-and-play GET electronic tuning module

• High-compression, lightweight forged piston design

• Bolt-on installation with no casing modifications required

Includes:

• Athena Big Bore Cylinder (85mm)

• Forged Piston

• Piston Rings, Wrist Pin, and Circlips

• GET Electronic Module and Wiring Harness

• Custom Athena Top-End Gasket Kit (Cylinder head and base gaskets)

• 
  

• Note: The cylinder head and base gaskets contained in the kit are specifically developed for Athena cylinder kits. Whenever the cylinder kit is disassembled, replace the gaskets with the specific Athena spare gasket kit. DO NOT use OE (Original Equipment) replacement gaskets.

The ATHENA P400210100074 Big Bore Cylinder Kit is designed for the Honda CRF 250 R model years 2022 through 2024. This kit features an 85mm bore and is identified as a big bore cylinder kit for the specified motorcycle application.

Built for use with the Honda CRF 250 R platform, this ATHENA cylinder kit provides a product-specific replacement or upgrade option for riders and technicians working on compatible engine applications. The clearly defined model-year coverage helps simplify product selection and installation planning.

With its dedicated part number and application-specific design, the P400210100074 kit is suited to service, rebuild, or performance-oriented engine projects involving the listed Honda CRF 250 R models. Verify the motorcycle application and engine requirements before purchase to ensure the kit is appropriate for the intended project.

Features:

• Brand: ATHENA
• Part Number: P400210100074
• Product Type: Big bore cylinder kit
• Application: Honda CRF 250 R
• Model Years: 2022–2024
• Bore Size: 85mm