2Bros Parts

CYLINDER FULL KIT 77MM YAMAHA WR/YZ 250 14-18, ATHENA P400485100049 STD BORE, (Piston included)

£523.94

4.1 Trustpilot 99.9% positive on eBay

Free UK delivery 2–4 business days

Out of Stock

ATHENA Standard Bore Cylinder Kit Ø 77 mm, 250 cc, Part No. P400485100049. This kit includes a high-quality aluminum cylinder with standard bore, a complete piston with piston pin and rings, and all necessary gaskets. The cylinder features a motor-nicksil nickel-silicon coating for smoothness and wear resistance. Developed in Italy by Athena's R&D Department, this cylinder kit offers performance, durability, and reliability, providing the same performance as original spare parts. It is designed to reduce friction and withstand high temperatures, pressures, and stresses. No modifications to the engine crankcase are required for installation. Bore Diameter: 77.00 mm, Compression Ratio: 13.5:1, Displacement: 250 cc, Net Weight: 1.45 Kg.

Specifications
SKU
56-K170.77.CKA
Brand
Athena
Availability
Out of Stock

Fitments (18)

MakeModelYear
YAMAHAWR 250F2015
YAMAHAWR 250F2016
YAMAHAWR 250F2017
YAMAHAWR 250F2018
YAMAHAWR R 2502015
YAMAHAWR R 2502016
YAMAHAWRF 2502015
YAMAHAWRF 2502016
YAMAHAYZ 250F2014
YAMAHAYZ 250F2015
YAMAHAYZ 250F2016
YAMAHAYZ 250F2017
YAMAHAYZ 250F2018
YAMAHAYZ 250FX2015
YAMAHAYZ 250FX2016
YAMAHAYZ 250FX2017
YAMAHAYZF 2502014
YAMAHAYZF 2502015
General Product Group
Engine
General Product Type
Cylinder Kits
General Size
77mm
Variant Id
253029
Delivery2–4 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

Athena Standard Bore Cylinder Kit - 77mm

Upgrade your motorcycle's performance with the Athena Standard Bore Cylinder Kit. Engineered in Italy, this kit features a lightweight aluminum cylinder with a precision nickel-silicon coating for exceptional smoothness and wear resistance. Designed to deliver the same performance as original spare parts, it ensures extreme reliability and optimal operation. The kit includes the high-quality aluminum cylinder, a complete piston assembly with pin and rings, and all necessary gaskets.

The Athena cylinder is crafted to withstand demanding conditions, including high temperatures, pressures, and stresses, validated through rigorous bench and road testing. Installation is straightforward, requiring no modifications to the engine crankcase.

Key Features:

  • Standard Bore Diameter: 77.00 mm
  • Displacement: 250 cc
  • Compression Ratio: 13.5:1
  • Durable nickel-silicon coating for enhanced smoothness and wear resistance
  • Lightweight aluminum construction
  • Piston designed for reduced friction
  • Includes cylinder, complete piston assembly, and all required gaskets
  • No engine crankcase modifications needed for installation

Technical Specifications:

  • Bore Diameter: 77.00 mm
  • Compression Ratio: 13.5:1
  • Displacement: 250 cc
  • Net Weight: 1.45 Kg
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

Out of stock