fits model: Yz490, It490. make: Yamaha.

( Brand: Wiseco Piston ), ( Manufacturer Part Number: 478M08700 ), ( Warranty Details: See Manufacturer )
The WISCO Piston 478M08700 is an excellent aftermarket replacement option for the stock piston in Yamaha YZ490 and IT490 models. This piston, specifically designed with an 87.0mm bore size, provides improved performance, durability, and reliability for off-road enthusiasts who demand the best from their engine.
Manufactured using advanced materials and technologies, the WISCO piston features a high-strength forging that ensures superior strength and rigidity. The forging process allows for a more uniform material distribution, reducing the likelihood of internal stress fractures and failures. With a top ring groove diameter of 72.0mm, this piston ensures precise fitment into the engine and improves ring sealing for enhanced combustion efficiency.
The underside of the piston deck features a sprinkled skirt coating that helps to minimize friction between the piston and the cylinder wall. This reduces wear and tear and ultimately contributes to improved engine longevity. The piston also comes with a wrist pin bore diameter of 21.10mm and a crank pin bore diameter of 23mm, ensuring compatibility with the engine's crankshaft.
The Thin WALL design of the WISCO piston optimizes weight, reducing the overall weight of the rotating elements in the engine, which contributes to increased power output and smoother engine response. The piston ring package includes a compression ring, two oil control rings, and one scraper ring, all used for optimal engine performance and durability. The piston ring gaps are preset to work with the given engine specifications and are easily interchangeable with the stock rings, making for an easy installation process.
Configured with a smaller piston crown dish, this piston enables a higher compression ratio for improved combustion efficiency, which ultimately leads to better power output and engine performance. Enhance the performance and reliability of your Yamaha YZ490 or IT490 engine with the WISCO Piston 478M08700.
The Wiseco Piston 478M08700 is a popular upgrade option for owners of the Yamaha YZ490 and IT490 motorcycles. This piston is specifically designed to enhance engine performance and durability. In this analysis, we will review the potential advantages and disadvantages of installing this aftermarket piston.
Advantages:1. Increased Power and Performance: The Wiseco piston is designed to provide better compression and enhanced combustion efficiency, resulting in additional power and improved performance.
2. Enhanced Durability: Wiseco pistons are known for their superior quality and durability due to their forged construction. This can lead to increased longevity and reliability for the engine.
3. Race-Proven Technology: Wiseco pistons have been used extensively in professional motocross and supercross racing. This race-proven technology contributes to the piston's high-performance capabilities.
4. Weight Savings: The Wiseco piston is lighter than the OEM (Original Equipment Manufacturer) piston, reducing unsprung weight and contributing to better bike handling.
5. Customizable: Wiseco offers various piston options, allowing riders to choose the best piston for their specific riding style and engine modification goals.
Disadvantages:1. Cost: The Wiseco piston can be more expensive than the OEM piston. Aftermarket parts often carry a premium price due to their higher quality and performance benefits.
2. Installation Complexity: Installing a new piston, particularly an aftermarket option, can require significant time and expertise. It is recommended to have the installation performed by a professional mechanic or engine builder.
3. Risk of Damage: Installing aftermarket parts can increase the risk of engine damage if not installed correctly. Properly following the installation instructions and consulting with a professional can minimize this risk.
4. Engine Rebalance: Installing a lighter piston like the Wiseco 478M08700 could change the overall weight distribution, requiring engine balancing to maintain optimal performance.
Conclusion:The Wiseco Piston 478M08700 offers numerous benefits for Yamaha YZ490 and IT490 owners, including increased power, enhanced durability, race-proven technology, weight savings, and customizability. However, the piston's premium price, installation complexity, potential for damage during installation, and need for engine rebalancing are potential drawbacks.
If you prioritize performance and durability, the Wiseco Piston 478M08700 may be the ideal upgrade for your Yamaha YZ490 or IT490. However, if cost is a significant concern or if you're not comfortable with the installation process, it might be best to stay with the OEM piston. Properly researching and considering these advantages and disadvantages will help you make an informed decision about whether this aftermarket piston is right for you.
Optimal cam shape and profile for peak HP service life. Superior strength/weight ratio utilizing Aerospace alloy. CNC machined. High-performance ring set.
Note: All kits cover a single cylinder only. All Wiseco Piston kits include 1 Piston, ring set, wrist pin and 2 cir clips. Highest quality, alloy pin. Precision machined, highest quality materials for strength and reduced friction.
Race proven designs. NOTE: Image is for reference only, actual product may vary slightly depending on your specific application. Extended life and sustained power. Consistently true and durable.
Chosen by top race teams, in all forms of racing.