TOP END PISTON & GASKET KIT 77MM YAMAHA WR/YZ 250 14-15, ATHENA P5F0770187008A, SET A
4.4 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
ATHENA Top End Piston Kit with Forged 4-Stroke Piston and Top End Gasket Kit. Piston diameter is 76.96 mm. The kit combines two essential engine components for high performance and reliability. Pistons are made from a special high-performance aluminum alloy with high silicon content, produced using state-of-the-art numerical control (CNC) machines. Some pistons feature a molybdenum disulfide coating on the skirts to reduce friction. Piston rings are Made in Japan with wear-resistant coatings (PVD or chromium nitride) for increased durability. Gasket kits are produced with strict adherence to manufacturer parameters, utilizing laser cutting for precision. Technical features include: Big End Pin Diameter (mm) 16x10x42, Bore Diameter (mm) 76.96, Compression Height (mm) 20.40, Compression Ratio 13.5:1, Displacement (cc) 250, Number Of Segments 2, Piston Pin Type Standard, Piston Type Forged. For competitive use.
- SKU
- 56-T1005.A_ATH
- Brand
- Athena
- Availability
- In Stock (1)
- Variant Id
- 309787
FULL DESCRIPTION
Athena Top End Piston and Gasket Kit
This Athena Top End Piston Kit provides a perfectly matched forged 4-stroke piston and top end gasket set, designed for optimal engine performance and reliability. Athena internally develops and tests all piston technologies and compatible gaskets, ensuring a high-performance and dependable engine rebuild.
Key Features
- Forged Piston: Manufactured using advanced numerical control (CNC) machines from a special high-performance aluminum alloy with a high silicon content for enhanced durability and performance, matching OE reliability.
- Smooth Piston Profile: Ensures regular airflow and proper flame propagation for efficient combustion.
- Molybdenum Disulfide Coating: Some pistons feature this coating on the skirts to reduce friction, further boosting performance and longevity.
- High-Quality Piston Rings: Made in Japan with wear-resistant coatings (PVD or chromium nitride) for reduced cylinder friction and increased durability.
- Reliable Gasket Kit: Developed with over 40 years of industry experience, Athena gasket kits utilize advanced technology and strict manufacturing parameters. Laser cutting ensures precision.
- Advanced Material Treatments: Gaskets incorporate surface treatments to address irregularities and material stress-relieving processes for improved sealing in critical areas.
Technical Specifications
- Big End Pin Diameter: 16x10x42 mm
- Bore Diameter: 76.96 mm
- Compression Height: 20.40 mm
- Compression Ratio: 13.5:1
- Displacement: 250 cc
- Number Of Segments: 2
- Piston Pin Type: Standard
- Piston Type: Forged
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00 (UK time).
Call or email us with your make, model and year and we will check it for you before you order.
Yes. We ship from the UK. Orders ship within 3 working days, then delivery to the United States takes 5–8 business days. The delivery price is shown at checkout before you pay. Delivery details
Yes. You have 14 days from delivery to return it, unused and in its original packaging. Contact us first and we will send you the return instructions. Returns policy
By card, PayPal, Apple Pay or Google Pay, or spread the cost with Klarna. Payment is taken securely by Stripe, and the options for your order are shown at checkout.
Any customs duties or import taxes charged in the United States are paid by you when the parcel arrives. Any tax we collect ourselves is shown at checkout before you pay.
More answers in our FAQ.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.