fits model: Yz80, Yz. make: Yamaha. year: 1980–1985.

( Manufacturer Part Number: 4ES-15121-02-00 ), ( Part Type: Engine Transmission Motor Case )
The 4ES-15121-02-00 is a high-quality replacement top end for the Yamaha YZ80 and YZ85 engines. This top end is specifically designed to fit the motor end of your two-stroke dirt bike, providing a reliable and dependable solution for any engine transmission issues you may be experiencing.
The top end kit includes all the necessary parts to replace the cylinder head, piston, and piston ring set. The cylinder head is made from high-quality aluminum alloy, ensuring durability and longevity. It features a precision-machined combustion chamber, which allows for optimal combustion and power delivery. The piston is also made from high-quality materials, with a hard-anodized aluminum alloy skirt for superior strength and durability. The piston ring set is designed to provide a tight seal between the piston and cylinder, reducing engine blowby and improving overall performance.
The bottom end of the engine is equally important, and this kit includes all the necessary parts to replace any worn or damaged components. The crankshaft is made from high-strength steel, ensuring that it can withstand the rigors of off-road racing. The connecting rods are also made from high-strength materials, with a precision-machined big end to ensure a tight fit with the crankshaft. The main and intermediate bearings are made from high-quality materials, providing a smooth and quiet operation.
The kit also includes a new clutch basket and clutch cover, which are both made from high-quality materials to ensure reliable operation. The clutch basket is precision-machined to provide a tight fit with the clutch plates, while the clutch cover is made from a durable plastic material that is resistant to impact and wear.
Overall, the 4ES-15121-02-00 is a high-quality replacement top end kit for the Yamaha YZ80 and YZ85 engines. It includes all the necessary parts to replace the cylinder head, piston, and piston ring set, as well as the bottom end components such as the crankshaft, connecting rods, and main and intermediate bearings. The kit is designed to provide a reliable and dependable solution for any engine transmission issues, ensuring that your dirt bike is back on the track in no time.
Pros of buying a 4ES-15121-02-00 Yamaha YZ80/YZ85 engine:1. Reliability: Yamaha is known for its high-quality engines, and the 4ES-15121-02-00 engine is no exception. It is built to last and is known for its durability.
2. Power: The YZ80/YZ85 engine is powerful and offers a great balance of power and weight, making it ideal for off-road riding.
3. Replacement Parts: Yamaha has a wide range of replacement parts available for the 4ES-15121-02-00 engine, making it easy to maintain and repair.
4. Compatibility: The engine is compatible with various YZ80/YZ85 models, making it a versatile option for riders who want to upgrade their bikes.
Cons of buying a 4ES-15121-02-00 Yamaha YZ80/YZ85 engine:1. Cost: The engine can be expensive, especially if you are looking for a new one. Used engines can be a more affordable option, but they may require more maintenance and repairs.
2. Availability: Depending on your location, finding a new or used engine may be challenging. You may need to order it online or from a specialty dealer.
3. Installation: Installing the engine can be a complicated process, especially if you are not experienced with motorcycles. You may need to hire a professional to install it for you.
Conclusion:The 4ES-15121-02-00 Yamaha YZ80/YZ85 engine is a reliable and powerful option for off-road riders. However, it can be expensive and may require professional installation. If you are looking for a high-quality engine, the Yamaha 4ES-15121-02-00 engine is a great option. However, you should consider your budget and experience level before making a purchase.
Recommendation:If you are an experienced off-road rider with a budget for a high-quality engine, the 4ES-15121-02-00 Yamaha YZ80/YZ85 engine is a great option. If you are on a tighter budget or not experienced with motorcycles, you may want to consider a less expensive or easier-to-install engine. You should also research the availability of replacement parts and installation options in your area before making a purchase.
Already purchased an item and need to return it.
When installing any used parts new gaskets and or seals are always recommended.