2Bros Parts

CYLINDER FULL KIT 77mm YAMAHA YZ 250F 19-26, ATHENA P400485100072 STD BORE, (Piston included)

$577.93

4.1 Trustpilot 99.9% positive on eBay

Delivery to United States 5–8 business days

Out of Stock

Athena Standard Bore Cylinder Kit, 77mm bore diameter, 250cc displacement. Features a lightweight aluminum cylinder with a motor-nicksil nickel-silicon coating for smoothness and wear resistance. Includes a complete piston with pin and rings, and all necessary gaskets. Developed to withstand high temperatures, pressures, and stresses. Compression ratio 13.5:1. Net weight 1.45 Kg. Part number P400485100072.

Specifications
SKU
56-K250.77.CKA
Brand
Athena
Availability
Out of Stock
General Product Group
Engine
General Product Type
Cylinder Kits
Variant Id
310557
Delivery5–8 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

Athena Standard Bore Cylinder Kit - 77mm

This Athena Standard Bore Cylinder Kit is meticulously engineered for optimal performance and durability. Developed and manufactured in Italy by Athena's expert R&D department, this kit features a lightweight aluminum cylinder with a nickel-silicon coating for superior smoothness and wear resistance. The included piston is specifically designed to minimize friction, ensuring a reliable and powerful engine.

This kit is designed to deliver the same performance as original spare parts, offering exceptional reliability and smooth operation. All components are built to withstand extreme temperatures, pressures, and stresses, validated through rigorous bench and road testing by Athena technicians. No modifications to the engine crankcase are required for installation.

Key Features:

  • Standard Bore Diameter: 77.00 mm
  • Displacement: 250 cc
  • Compression Ratio: 13.5:1
  • Durable nickel-silicon coating developed by Athena
  • Lightweight aluminum cylinder construction
  • Piston designed for reduced friction
  • Includes high-quality aluminum cylinder, complete piston with pin and rings, and all necessary gaskets
  • Engineered to withstand high temperatures, pressures, and stresses
  • Direct fit installation without engine crankcase modifications

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 (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.

Apply for Trade

Out of stock