fits model: Yz250f. make: Yamaha. year: 2007–2009.

( Manufacturer Part Number: 5XC-15150-20-YX ), ( Part Type: Engine Motor Crank Case )
The 5xc-15100-21-yx and 5xc-15150-20-yx Yamaha YZ250F crank crankcase are essential components of your Yamaha YZ250F motorcycle, specifically for models produced between 2007 and 2009. These crankcases are meticulously crafted to house the engine's crankshaft, providing a robust foundation for the overall engine performance.
The 5xc-15100-21-yx crankcase is designed for the 5xc-15100 engine, which is a 2-stroke, reed-valve, single-cylinder engine. This crankcase is engineered to provide optimal power delivery and reliability, with a focus on lightweight construction to minimize engine weight for improved handling and agility. The surface of the crankcase is finished with a durable, corrosion-resistant coating to ensure long-term protection and performance.
Similarly, the 5xc-15150-20-yx crankcase is designed for the 5xc-15150 engine, a 4-stroke, fuel-injected, single-cylinder engine. This crankcase is engineered to provide enhanced power and torque, and is designed to withstand the increased stresses and pressures associated with a 4-stroke engine. The crankcase is also finished with a durable, corrosion-resistant coating to ensure long-term protection and performance.
Both crankcases are precision-machined to ensure a perfect fit with their respective engines, and are manufactured to meet Yamaha's high-quality standards. They are also designed to be easy to install, with clear installation instructions included.
In summary, the 5xc-15100-21-yx and 5xc-15150-20-yx Yamaha YZ250F crank crankcases are essential components of your YZ250F motorcycle, providing a robust foundation for engine performance and ensuring long-term reliability. These crankcases are precision-machined and finished with a durable, corrosion-resistant coating, and are designed to be easy to install.
Pros of buying a 5xc-15100-21-yx and 5xc-15150-20-yx Yamaha YZ250F crank crankcase (2007-2009):1. Compatibility: These crankcases are specifically designed for Yamaha YZ250F models from 2007 to 2009, ensuring a perfect fit and seamless integration with other engine parts.
2. Durability: Yamaha is known for its high-quality engine components, and these crankcases are no exception. They are built to withstand the rigors of off-road racing and provide reliable performance over time.
3. Availability: As these are common parts for the YZ250F, they are widely available from various retailers, both online and offline. This makes it easy to find a replacement if needed.
4. Cost-Effective: Compared to buying a completely new engine, replacing just the crankcase can be a more cost-effective solution, especially if the engine itself is in good condition.
Cons of buying a 5xc-15100-21-yx and 5xc-15150-20-yx Yamaha YZ250F crank crankcase (2007-2009):1. Installation: Replacing the crankcase is not a straightforward task and requires specialized tools and mechanical skills. If you're not confident in your abilities, it's best to seek professional help to avoid damaging other parts or causing additional problems.
2. Quality Concerns: While Yamaha is a reputable brand, there's always a risk of receiving a substandard or used part. Make sure to purchase from a trusted retailer to minimize this risk.
3. Limited Upgrade Potential: Replacing the crankcase does not offer any significant performance upgrades, unlike replacing the engine or other major components.
Recommendation:If you're in need of a replacement crankcase for your Yamaha YZ250F (2007-2009), the 5xc-15100-21-yx and 5xc-15150-20-yx are solid choices due to their compatibility, durability, and availability. However, it's crucial to ensure you have the necessary mechanical skills and tools for installation, or seek professional help. Additionally, purchasing from a trusted retailer can help mitigate any quality concerns. Ultimately, the decision to buy these crankcases depends on your specific needs, budget, and technical abilities.
Look closely at the pictures. As a result there is some surface rust on some of the bearings. There are some scuffs and scratches on the case exterior from normal use. These came from a strong running 2008 YZ250F.
Up for sale is a used matching oem crankcase pair for a Yamaha YZ250F. No cracks, damage, or issues. These cases are in good working condition. Other than this the cases are in excellent structural condition.
For this reason I would recommend replacing all of the bearings and for sure the crank bearings. What you see is what you get. It appears that some coolant got into the cases and then the bike sat for a while.