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Start ShoppingATHENA Hyper Race Cylinder Kit - 70cc Big Bore Racing Piston Kit for High-Performance Powersports
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Description
Elevate your powersports engine's performance with the ATHENA Hyper Race Cylinder Kit, engineered for racers demanding peak power and reliability. This premium 70cc big bore piston kit combines precision machining with durable materials to deliver unmatched horsepower and longevity for track and street use.
Key Features
- High-Performance Racing Design: Optimized for maximum power output with reinforced cylinder walls and precision-balanced piston skirts.
- Complete Kit Compatibility: All components are available separately for custom builds, ensuring perfect fitment with your engine setup.
- Durable Racing Materials: Made from aerospace-grade alloys and heat-treated steel for superior strength and thermal resistance.
- Easy Installation: Designed for straightforward integration with existing engine components, reducing assembly time.
Why Choose This Product
Whether you're modifying a 70cc scooter, ATV, or off-road vehicle, this cylinder kit delivers the performance edge needed for competitive racing. Its modular design allows for tailored customization, while the reinforced construction ensures long-term reliability under extreme conditions. The kit's compatibility with both stock and modified engines makes it a versatile choice for enthusiasts seeking to push their machine's limits without compromising durability.
SKU:
GMC81D273F
MPN:
070200
UPC:
8050444897096
Category:
Piston kits & Components
Brand:
Athena
Stock:
In Stock
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Elevate your powersports engine's performance with the ATHENA Hyper Race Cylinder Kit, engineered for racers demanding peak power and reliability. This premium 70cc big bore piston kit combines precision machining with durable materials to deliver unmatched horsepower and longevity for track and street use.
Key Features
- High-Performance Racing Design: Optimized for maximum power output with reinforced cylinder walls and precision-balanced piston skirts.
- Complete Kit Compatibility: All components are available separately for custom builds, ensuring perfect fitment with your engine setup.
- Durable Racing Materials: Made from aerospace-grade alloys and heat-treated steel for superior strength and thermal resistance.
- Easy Installation: Designed for straightforward integration with existing engine components, reducing assembly time.
Why Choose This Product
Whether you're modifying a 70cc scooter, ATV, or off-road vehicle, this cylinder kit delivers the performance edge needed for competitive racing. Its modular design allows for tailored customization, while the reinforced construction ensures long-term reliability under extreme conditions. The kit's compatibility with both stock and modified engines makes it a versatile choice for enthusiasts seeking to push their machine's limits without compromising durability.| SKU | GMC81D273F |
|---|---|
| MPN | 070200 |
| UPC/GTIN | 8050444897096 |
| Brand | Athena |
| Category | Piston kits & Components |
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Featured Review
| Make | Model | Years |
|---|---|---|
| Honda | CRF450R | 2019-2023 |
| Honda | CRF450RX | 2019-2023 |
| Honda | CRF450RL | 2020-2024 |
Frequently Asked Questions
No, it's a drop-in replacement for stock bore size on compatible models.
Race gas recommended (91+ octane). Requires rejetting or ECU flash for optimal performance.
Designed for racing only. Removes emissions components and increases emissions.
No, must use the included forged Hyper Race piston. Stock piston won't fit.
Nikasil cylinder, forged piston, rings, circlips, pin, base gasket, head gasket, exhaust gasket.
Installation Guide
Difficulty
Hard
Est. Time
4 hr 0 min
Tools Required
- Engine hoist or stand
- Torque wrench
- Piston ring pliers
- Micrometer
- Honing tool
- Socket set
- Case splitter
Pro Tips
- Hone cylinder to manufacturer's specs (Ra 0.6-0.8μm)
- Pre-lube piston skirt and rings with assembly lube
- Check squish clearance (0.9-1.1mm)
- Replace all gaskets and O-rings in kit
Common Mistakes to Avoid
- Improper piston ring installation
- Insufficient cylinder honing
- Incorrect torque on head studs
- Not gapping rings correctly
Comparison vs Stock/OEM
Stock cylinder is cast aluminum with steel sleeve. Athena uses nikasil-plated aluminum with forged piston vs cast stock piston.
Improvements
- +5-8 HP gains
- Better heat dissipation
- Higher RPM capability
- Improved ring seal
- Lighter rotating mass
Considerations
- Requires race fuel
- More frequent rebuilds at race pace
- Not emissions compliant
Durability & Warranty
Expected Lifespan
20-40 hours racing / 100+ hours trail use
Warranty
1 year manufacturer defect warranty
Maintenance
Inspect rings every 10 hours racing. Measure cylinder bore wear every 20 hours. Use race oil.
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