Standard Bore Cylinder Kit Ø 78 mm, 250 cc with Gaskets
Race Use Only Product – Not intended for street use – Please check details on the “Race use only” footer’s section
WARNING: the cylinder head and base gaskets contained in the kit are specifically developed for Athena cylinders kits. Whenever the cylinder kit is disassembled, replace the gaskets with the specific Athena spare gasket kit: DO NOT use OE replacement gaskets.
Description
Restore Your KTM EXC-F 250’s Original Performance
Bring your KTM EXC-F 250 back to peak condition with Athena’s Standard Bore Cylinder Kit, engineered for reliability, durability, and precision. This kit is the perfect solution for riders and mechanics who want to rebuild the engine to OEM specifications without compromising quality.
Premium Components for a Complete Rebuild
The kit includes:
High-grade aluminum cylinder for optimal heat transfer and wear resistance.
Forged piston CNC-machined for tight tolerances and coated with molybdenum disulfide to minimize friction and noise.
Pin and rings made from aerospace-grade materials for superior strength and smooth operation.
Complete gasket set, featuring an MLS (Multi-layer Steel) head gasket laser-cut from stainless steel for perfect sealing under high pressure and temperature.
OEM-Level Fit and Easy Installation
Athena’s Standard Bore Kit is designed to match original engine specifications, ensuring perfect compatibility with existing components. Installation is straightforward with no modifications required.
Proven Reliability for Long-Term Performance
Backed by Athena’s racing experience and partnerships with leading manufacturers, this kit guarantees consistent performance and durability even under demanding conditions.
Bullet points
Aluminum cylinder with a special nickel and silicon coated barrel
Forged piston with anti-friction coating
Complete gasket set with laser-cut MLS head gasket
Perfect OEM fit for easy, reliable installation
Technical features
| Bore Diameter (mm) | 78.00 |
| Compression Ratio | STD |
| Displacement (cc) | 249.00 |
| Line | Enduro |
| Net Weight (Kg) | 1.47 |
- Compression Height (mm): 19.40
- Displacement (cc): 250.00
- Big End Pin Diameter (mm): 16x9x38,2
- Number Of Segments: 2
- Compression Height (mm): 19.40
- Displacement (cc): 250.00
- Big End Pin Diameter (mm): 16x9x38,2
- Number Of Segments: 2
- Compression Height (mm): 19.40
- Displacement (cc): 250.00
- Big End Pin Diameter (mm): 16x9x38,2
- Number Of Segments: 2
- Net Weight (Kg): 0.12
- Manufacturer: ATHENA
- Net Weight (Kg): 0.06
- Oil Seal Total Height (mm): 11.00
- Oil Seal External Diameter (mm): 54.00
- Net Weight (Kg): 0.40
- Manufacturer: SKF
- Net Weight (Kg): 0.05
- Oil Seal Total Height (mm): 9.00
- Dust Seal Total Height (mm): 4.90
- Manufacturer: ATHENA
- Net Weight (Kg): 0.06
- Oil Seal Total Height (mm): 10.50
- Oil Seal External Diameter (mm): 53.00
- Manufacturer: ATHENA
- Net Weight (Kg): 0.05
- Oil Seal Total Height (mm): 10.50
- Oil Seal External Diameter (mm): 52.00
- Manufacturer: ATHENA
- Net Weight (Kg): 0.05
- Oil Seal Total Height (mm): 9.50
- Oil Seal External Diameter (mm): 53.00
- Manufacturer: ATHENA
- Net Weight (Kg): 0.06
- Oil Seal Total Height (mm): 11.00
- Oil Seal External Diameter (mm): 50.00
United Kingdom 