Athena
Athena Inner Dome O-Ring Kit 54mm Factory — Fits 1997-2021 Yamaha YZ125
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Athena Inner Dome O-Ring Kit 54mm Factory — Fits 1997-2021 Yamaha YZ125
Athena

Athena Inner Dome O-Ring Kit 54mm Factory — Fits 1997-2021 Yamaha YZ125

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SKU: ATHP400485999003

About Athena Athena (Italy) is the OE performance brand for ...Read more

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$13.09 $14.95
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

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About Athena

Athena (Italy) is the OE performance brand for motorcycle and powersports — cylinder kits, gasket kits, ECUs, and racing electronics used by KTM, Husqvarna, and Beta racing programs.

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Restore Your Yamaha YZ125 Top-End Seal

Ensure your Yamaha YZ125 maintains optimal compression with the Athena 54mm Inner Dome O-Ring Kit. Designed to meet or exceed OEM specifications, this kit is essential for any top-end rebuild. Whether you are a weekend warrior or a competitive racer, maintaining a perfect seal in your cylinder head is critical for preventing coolant leaks and power loss.

Technical Specifications & Benefits

  • Precision Fit: Engineered specifically for the 54mm Athena Factory cylinder dome.
  • High-Temperature Resistance: Constructed from premium materials to withstand extreme combustion chamber heat.
  • Reliable Sealing: Prevents coolant contamination and maintains consistent compression ratios.
  • Compatibility: Designed for a wide range of Yamaha YZ125 models from 1997 through 2021.

When you perform a top-end service, never reuse old O-rings. Old, flattened seals are a leading cause of head gasket failure and engine overheating. This Athena kit provides the exact dimensions required to restore your engine to factory-fresh sealing standards. By choosing Athena, you are investing in the same engineering excellence that powers top-tier motocross teams worldwide. Get your engine running at its best with reliable components from GGCRACING.

About Athena

Athena (Italy) is the OE performance brand for motorcycle and powersports — cylinder kits, gasket kits, ECUs, and racing electronics used by KTM, Husqvarna, and Beta racing programs.

Watch in action

Restore Your Yamaha YZ125 Top-End Seal

Ensure your Yamaha YZ125 maintains optimal compression with the Athena 54mm Inner Dome O-Ring Kit. Designed to meet or exceed OEM specifications, this kit is essential for any top-end rebuild. Whether you are a weekend warrior or a competitive racer, maintaining a perfect seal in your cylinder head is critical for preventing coolant leaks and power loss.

Technical Specifications & Benefits

  • Precision Fit: Engineered specifically for the 54mm Athena Factory cylinder dome.
  • High-Temperature Resistance: Constructed from premium materials to withstand extreme combustion chamber heat.
  • Reliable Sealing: Prevents coolant contamination and maintains consistent compression ratios.
  • Compatibility: Designed for a wide range of Yamaha YZ125 models from 1997 through 2021.

When you perform a top-end service, never reuse old O-rings. Old, flattened seals are a leading cause of head gasket failure and engine overheating. This Athena kit provides the exact dimensions required to restore your engine to factory-fresh sealing standards. By choosing Athena, you are investing in the same engineering excellence that powers top-tier motocross teams worldwide. Get your engine running at its best with reliable components from GGCRACING.

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