2Bros Parts

PISTON KIT B 77MM KAWASAKI KX 250 15-16, ATHENA S5F07700002B

£166.55

4.1 Trustpilot 99.9% positive on eBay

Free UK delivery 2–4 business days

Spread the cost with Klarna 18+, T&Cs apply

1

ATHENA Forged Piston Ø 76.97 mm. This piston kit includes the piston, pin, circlips, and piston rings. The piston is made of a special high-performance aluminum alloy with high silicon content. Some piston skirts have a molybdenum disulfide coating to reduce friction. The piston rings are produced in Japan with wear-resistant coatings. Technical features: Big End Pin Diameter (mm) 16x9x41.1, Bore Diameter (mm) 76.97, Compression Height (mm) 19.90, Compression Ratio 13.8:1, Displacement (cc) 250, Net Weight (Kg) 0.18, Number Of Segments 2, Piston Pin Type Biconical, Piston Type Forged. Part No. 56-W331.B.ATH.

Specifications
SKU
56-W331.B.ATH
Brand
Athena
Availability
In Stock (2)

Fitments (2)

MakeModelYear
KAWASAKIKX 250F2015
KAWASAKIKX 250F2016
General Product Group
Engine
General Product Type
Pistons & Kits
General Size
77mm
Variant Id
289760
Delivery2–4 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

Athena Forged Piston Kit B 77mm

Upgrade your motorcycle's performance with this high-quality Athena forged piston kit. Engineered in Italy by Athena's R&D department, this piston is designed to deliver exceptional reliability and enhanced performance for off-road riding.

Crafted from a special high-performance aluminum alloy with a high silicon content, this piston offers superior strength and durability. Advanced CNC machining ensures dimensional tolerances of less than 0.01 mm for a perfect fit. The smooth piston profile promotes optimal air flow and combustion for increased power.

Some piston skirts feature a molybdenum disulfide coating, applied by screen printing, which further reduces friction for improved performance and extended lifespan. Athena pistons are rigorously tested on engine dynamometers and on the track to ensure they meet the highest quality standards and can withstand extreme conditions.

This piston kit includes the piston, piston pin, circlips, and piston rings. The piston rings are produced in Japan with wear-resistant coatings (PVD or chromium nitride) to increase durability and longevity. They are designed to adapt perfectly to the cylinder liner, even at low tangential load, minimizing friction and maximizing performance.

Key Features:

  • Piston Type: Forged
  • Bore Diameter: 76.97 mm
  • Compression Height: 19.90 mm
  • Compression Ratio: 13.8:1
  • Number Of Segments: 2
  • Piston Pin Type: Biconical
  • Includes: Piston, pin, circlips, and piston rings
  • Material: High-performance aluminum alloy with high silicon content
  • Coating: Molybdenum disulfide coating on some piston skirts for reduced friction
  • Piston Ring Origin: Japan, with wear-resistant coatings
  • Manufacturing: Precision CNC machined for tight tolerances
  • Testing: Dynamometer and track tested for performance and reliability

Note: Products intended for competitive use or high-performance applications may not be covered by standard warranty unless a clear faultiness is present. Products designed for increased displacement and power beyond legal road limits are intended exclusively for competitive use.

Before you buy

QUESTIONS? JUST ASK

Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00.

Check the fitment table on this page against your make, model and year. Not sure? Call or email us and we will check it for you before you order.

UK delivery is £4.99, or free on orders over £60. Orders ship within 3 working days, then delivery takes 2–4 business days. 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.

More answers in our FAQ.

Trade pricing available

Buying parts for your business? Apply for a 2BrosParts trade account.

Apply for Trade
1