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Start ShoppingAthena Forged Piston Kit for 85mm Bore - High-Performance Engine Components
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Description
Elevate your powersports engine's performance with Athena's premium piston kit designed for maximum power and reliability. Engineered for high-output applications, this 85mm bore kit combines advanced materials with precision engineering to deliver unmatched durability and efficiency.
Key Features
- Bore Size: 85mm precision bore for optimal cylinder fitment
- Piston Type: Forged construction for superior strength and heat resistance
- Material: Hypereutectic aluminum alloy with ceramic top coating for enhanced wear resistance
- Kit Components: Complete set includes piston, rings, wrist pin, and circlips for hassle-free installation
- Compression Ratio: 12.5:1 optimized ratio for balanced power and fuel efficiency
Why Choose This Product
Whether you're modifying a high-performance motorcycle or upgrading a racing engine, this piston kit offers critical advantages. The forged hypereutectic alloy resists thermal fatigue while the ceramic coating reduces friction, ensuring long-term reliability. The 12.5:1 compression ratio delivers responsive power delivery without sacrificing fuel economy. With all necessary components included, this kit simplifies engine upgrades while maintaining factory-level precision and performance.
SKU:
GM12DA5BEE
MPN:
S410485302007.B
UPC:
8052204290475
Category:
Piston kits & Components
Brand:
Athena
Stock:
In Stock
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Elevate your powersports engine's performance with Athena's premium piston kit designed for maximum power and reliability. Engineered for high-output applications, this 85mm bore kit combines advanced materials with precision engineering to deliver unmatched durability and efficiency.
Key Features
- Bore Size: 85mm precision bore for optimal cylinder fitment
- Piston Type: Forged construction for superior strength and heat resistance
- Material: Hypereutectic aluminum alloy with ceramic top coating for enhanced wear resistance
- Kit Components: Complete set includes piston, rings, wrist pin, and circlips for hassle-free installation
- Compression Ratio: 12.5:1 optimized ratio for balanced power and fuel efficiency
Why Choose This Product
Whether you're modifying a high-performance motorcycle or upgrading a racing engine, this piston kit offers critical advantages. The forged hypereutectic alloy resists thermal fatigue while the ceramic coating reduces friction, ensuring long-term reliability. The 12.5:1 compression ratio delivers responsive power delivery without sacrificing fuel economy. With all necessary components included, this kit simplifies engine upgrades while maintaining factory-level precision and performance.| SKU | GM12DA5BEE |
|---|---|
| MPN | S410485302007.B |
| UPC/GTIN | 8052204290475 |
| Brand | Athena |
| Category | Piston kits & Components |
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Featured Review
| Make | Model | Years |
|---|---|---|
| KTM | 450 SX-F | 2019-2024 |
| KTM | 350 SX-F | 2019-2024 |
| Husqvarna | FC 450 | 2019-2024 |
| Husqvarna | FC 350 | 2019-2024 |
Frequently Asked Questions
Yes, light honing with #400 stone recommended for proper ring seating.
Yes, typically 5-10% power increase on 350cc models, stock power on 450cc models.
Fuel mapping adjustment recommended for optimal performance and to prevent lean conditions.
No, piston kit only. Gaskets, cylinder, and head studs sold separately.
Installation Guide
Difficulty
Hard
Est. Time
3 hr 0 min
Tools Required
- Piston pin press
- Torque wrench
- Micrometer
- Ring compressor
- Engine stand
Pro Tips
- Measure cylinder bore before installation
- Follow exact break-in procedure
- Use assembly lube on wrist pin and rings
Common Mistakes to Avoid
- Incorrect ring gap orientation
- Overheating during break-in
- Not verifying bore size
Comparison vs Stock/OEM
Forged construction vs cast OEM piston; larger 85mm bore option available
Improvements
- Higher strength for high RPM abuse
- Better heat dissipation
- Larger displacement option for 350cc models
Considerations
- Requires ECU/fuel tuning
- More expensive than stock replacement
Durability & Warranty
Expected Lifespan
40-60 hours racing / 100+ hours trail use
Warranty
1 year manufacturer defect warranty
Maintenance
Inspect rings at 20 hours, proper break-in critical for longevity
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