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Start ShoppingAthena OE-Style Cylinder Head for YZ125 - High-Strength Aluminum Alloy Engine Replacement
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Description
Upgrade your YZ125's engine performance with Athena's OE-style cylinder head. Crafted from high-strength aluminum alloy and precision CNC-machined for perfect fitment, this replacement head delivers enhanced heat dissipation and long-term reliability for serious riders.
Key Features
- High-Strength Aluminum Alloy: Durable construction withstands extreme engine temperatures and pressures.
- NiSiC Coated Exhaust Port: Advanced coating improves heat dissipation for optimal engine efficiency.
- OEM Dimensions: Exact 6.5" x 4.5" x 4" sizing ensures seamless installation on original equipment.
- Lightweight Design: Just 2.8 lbs reduces engine strain while maintaining structural integrity.
Why Choose This Product
Engineers designed this cylinder head to match OEM specifications while incorporating advanced materials for better performance. The precision CNC machining ensures perfect alignment with factory components, while the NiSiC coating protects against thermal stress. Riders benefit from improved engine efficiency, reduced overheating risks, and a reliable replacement that maintains factory-like performance without compromising durability.
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$248.95
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Upgrade your YZ125's engine performance with Athena's OE-style cylinder head. Crafted from high-strength aluminum alloy and precision CNC-machined for perfect fitment, this replacement head delivers enhanced heat dissipation and long-term reliability for serious riders.
Key Features
- High-Strength Aluminum Alloy: Durable construction withstands extreme engine temperatures and pressures.
- NiSiC Coated Exhaust Port: Advanced coating improves heat dissipation for optimal engine efficiency.
- OEM Dimensions: Exact 6.5" x 4.5" x 4" sizing ensures seamless installation on original equipment.
- Lightweight Design: Just 2.8 lbs reduces engine strain while maintaining structural integrity.
Why Choose This Product
Engineers designed this cylinder head to match OEM specifications while incorporating advanced materials for better performance. The precision CNC machining ensures perfect alignment with factory components, while the NiSiC coating protects against thermal stress. Riders benefit from improved engine efficiency, reduced overheating risks, and a reliable replacement that maintains factory-like performance without compromising durability.
| SKU | GM11D80347 |
|---|---|
| MPN | P400485200001 |
| UPC/GTIN | 8051764546121 |
| Brand | Athena |
| Category | Engine |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Yamaha | YZ125 | 2008-2024 |
Frequently Asked Questions
Yes, complete kit includes cylinder head, gasket, and O-rings.
This is OE-style stock bore (54mm) replacement, not big bore.
Yes, direct bolt-on replacement for 2008-2024 YZ125.
NiSiC coating improves heat transfer and durability, slight power gains from better porting.
Installation Guide
Difficulty
Medium
Est. Time
2 hr 0 min
Tools Required
- torque wrench
- socket set
- piston pin circlip pliers
- valve spring compressor
Pro Tips
- Replace head gasket and O-rings (included)
- Check valve clearances after install
- Use assembly lube on cam lobes
Common Mistakes to Avoid
- Incorrect torque on head bolts (spec is 12 Nm)
- Not cleaning mating surfaces thoroughly
Comparison vs Stock/OEM
Athena replica of OEM head with upgraded NiSiC exhaust port coating vs. stock aluminum
Improvements
- Better heat dissipation (up to 40% improved)
- Enhanced durability for racing
- Precision CNC porting for minor power gains
Considerations
- Higher cost than OEM ($400 vs $300), same weight
Durability & Warranty
Expected Lifespan
50+ hours racing / 2 seasons motocross
Warranty
2 year manufacturer defect warranty
Maintenance
Check valve clearances every 10 hours, inspect for cracks annually
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