fits model: Yz250. make: Yamaha. year: 2006.

( Manufacturer Part Number: 5UP-11311-01-00 ), ( Type: Cylinder Head )
The Yamaha YZ250 is a powerful and agile dirt bike that was first introduced in 2006. This particular model, denoted by the part number 5UP-11311-01-00, is characterized by its B4491 cylinder.
The YZ250 is a two-stroke bike that boasts a potent 249cc liquid-cooled 2-stroke engine. The cylinder, which is an integral part of this powerplant, is responsible for housing the engine's piston and transferring the combustion forces to the crankshaft for propulsion. The B4491 cylinder features a high-compression boron-silicon aluminum sleeve for durability and optimal heat dissipation.
This cylinder also incorporates Yamaha's renowned Power Valve System (PVS). The PVS uses a force-fed intake system and a petal-type power valve that adjusts exhaust gas flow to optimize power delivery throughout the rev range. With precise and responsive engine performance, this Yamaha YZ250 is an excellent choice for competitive racers and serious off-road enthusiasts.
Additionally, this 2006 YZ250 model comes with a high-performance aluminum frame that provides excellent handling and control. Designed using computer-aided analysis and tested extensively in various conditions, the frame contributes to the bike's balanced feel and stability. it also has comes with a large 2.14 gallon fuel tank and a heavy-duty 5-speed transmission.
In summary, the 2006 Yamaha YZ250 with the B4491 cylinder is a high-performance dirt bike that combines power, agility, and advanced technology. The liquid-cooled 2-stroke engine, featuring the Power Valve System in the B4491 cylinder, delivers impressive power and torque across the rev range. The lightweight and strong aluminum frame ensures optimal handling and excellent control, making it a must-have for competitive riders and serious off-road enthusiasts.
The Yamaha YZ250 (Model Number: 5UP-11311-01-00 from Year 2006) is a popular choice amongst motocross enthusiasts due to its powerful engine and agile handling. Yet, like any other motorcycle, it has its own set of advantages and disadvantages.
Advantages:1. Powerful Engine: The Yamaha YZ250 is powered by a potent, liquid-cooled, four-stroke, single-cylinder engine. Its 249cc displacement delivers impressive performance, translating to quick acceleration and responsive power.
2. Agile Handling: With its lightweight frame and well-balanced chassis, the Yamaha YZ250 offers exceptional handling. The motorcycle is a joy to maneuver, making it an excellent choice for both beginners and experienced riders looking for a nimble bike.
3. Quality Componentry: Yamaha uses high-quality components, ensuring that the motorcycle stands the test of time. The YZ250 boasts of top-shelf suspensions, brakes, and a durable frame.
4. Competitive Price: Compared to some other premium motorcycles in its class, the Yamaha YZ250 is relatively affordable and worth the investment.
Disadvantages:1. Intimidating for Beginners: The YZ250 offers powerful performance and advanced features, making it potentially intimidating for novice riders. Its high-performance capabilities could be overwhelming for those without sufficient experience.
2. Limited Comfort: Motocross bikes like the Yamaha YZ250 aren't designed with long-distance comfort in mind. The riding position is aggressive, and the seat is relatively hard, which could lead to fatigue during prolonged rides.
3. Limited Storage: This motorcycle is focused on racing and off-road riding, and as such, doesn't come with significant storage capacity. This might be a downside for riders who need to carry extra items with them during their rides.
4. Fuel Efficiency: The Yamaha YZ250 is thirsty for fuel. Its powerful engine consumes a lot of liquid energy, so riders should be prepared for frequent refueling.
Conclusion:The Yamaha YZ250 (5UP-11311-01-00 from 2006) is an excellent choice for those looking for a potent and agile motocross bike. It offers fantastic performance, impressive handling, durable construction, and a competitive price. However, it comes with some trade-offs, such as its intimidating nature for beginners, limited comfort, storage capabilities, and fuel efficiency.
If you're a seasoned motocross rider seeking a powerful and agile bike, the Yamaha YZ250 is an exceptional choice. If comfort, longer rides, or more storage are a priority, you may want to consider other motorcycle options. Ultimately, the decision depends on your experience, preferences, and riding style.
2006 Yamaha Yz250 OEM Cylinder B4491, This cylinder is used. It does have some scratches that can be felt with a fingernail. Removed From: 2006 Yamaha YZ250 with miles.