Description
New Athena 300cc cylinder big bore kit part number P400485100042
Fits the 2003-2025 YZ250
The picture is directly from Athena, Pictures contents make up this complete kit.
Kits include aluminum cylinder with nickel-carbide coating designed with larger water jackets.
Includes Forged piston, rings, clips and pin.
Athena top-end gasket set includes required seals and hardware.
Easy-to-follow step-by-step installation instructions.
Most are bolt-on; no machining required except where noted.
Technical features
| Bore Diameter (mm) | 72.00 |
| Bore Gain (mm) | + 5.6 |
| Compression Ratio | 15.0:1 |
| Displacement (cc) | 293.00 |
| Net Weight (Kg) | 3.95 |
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