2Bros Parts

CYLINDER FULL KIT +5.60mm BIG BORE 72.00mm YAMAHA 2003 - 2025 YZ 2T 250 ATHENA P400485100042

$1,255.41

4.1 Trustpilot 99.9% positive on eBay

Delivery to United States 5–8 business days

Spread the cost with Klarna

1

Athena Big Bore Cylinder Kit for Yamaha YZ 250 2T. Increases displacement to 293cc with a bore diameter of 72.00mm (+5.60mm over stock). Features a high-quality aluminum cylinder with a nickel-silicon coating for durability and wear resistance. Designed for direct installation without modifications to the engine crankcase. Bore diameter is 72.00mm, with a bore gain of +5.6mm. Compression ratio is 15.0:1. Displacement is 293cc. Net weight is 3.50 kg. Includes aluminum cylinder, cylinder head, complete piston (with piston pin and rings), exhaust valve kit, and gasket kit.

Specifications
SKU
56-K156.72.CKA
Brand
Athena
Availability
In Stock (8)

Fitments (36)

MakeModelYear
YAMAHAYZ 2502003
YAMAHAYZ 2502004
YAMAHAYZ 2502005
YAMAHAYZ 2502006
YAMAHAYZ 2502007
YAMAHAYZ 2502008
YAMAHAYZ 2502009
YAMAHAYZ 2502010
YAMAHAYZ 2502011
YAMAHAYZ 2502012
YAMAHAYZ 2502013
YAMAHAYZ 2502014
YAMAHAYZ 2502015
YAMAHAYZ 2502016
YAMAHAYZ 2502017
YAMAHAYZ 2502018
YAMAHAYZ 2502019
YAMAHAYZ 2502020
YAMAHAYZ 2502021
YAMAHAYZ 2T 2502003
YAMAHAYZ 2T 2502004
YAMAHAYZ 2T 2502005
YAMAHAYZ 2T 2502006
YAMAHAYZ 2T 2502007
YAMAHAYZ 2T 2502008
YAMAHAYZ 2T 2502009
YAMAHAYZ 2T 2502010
YAMAHAYZ 2T 2502011
YAMAHAYZ 2T 2502012
YAMAHAYZ 2T 2502013
YAMAHAYZ 2T 2502014
YAMAHAYZ 2T 2502015
YAMAHAYZ 2T 2502016
YAMAHAYZ 2T 2502017
YAMAHAYZ 2T 2502018
YAMAHAYZ 2T 2502019
General Product Group
Engine
General Product Type
Cylinder Kits
Variant Id
252968
Delivery5–8 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

Athena Big Bore Cylinder Kit for Yamaha YZ 250 2T - 293cc

Upgrade your Yamaha YZ 250 2T with the Athena Big Bore Cylinder Kit, engineered in Italy for enhanced performance. This comprehensive kit increases your engine's displacement to 293cc, featuring a 72.00mm bore diameter which is a +5.60mm increase over stock.

The high-quality aluminum cylinder is treated with a durable nickel-silicon coating, providing exceptional wear resistance for longevity. Designed for a straightforward installation, this kit does not require any modifications to your engine's crankcase.

Key Features:

  • Increased Displacement: Boosts your engine to 293cc for more power.
  • Oversized Bore: Features a 72.00mm bore diameter (+5.60mm over stock).
  • High Compression: Achieves a 15.0:1 compression ratio.
  • Durable Coating: Nickel-silicon coated cylinder for superior wear resistance.
  • Complete Kit: Includes all necessary components for installation.
  • Direct Fit: No modifications needed for the engine crankcase.

Specifications:

  • Bore Diameter: 72.00mm
  • Bore Gain: +5.6mm
  • Compression Ratio: 15.0:1
  • Displacement: 293cc
  • Net Weight: 3.50 kg

Included Components:

  • Aluminum Cylinder
  • Cylinder Head
  • Complete Piston (with pin and rings)
  • Exhaust Valve Kit
  • Gasket Kit
Before you buy

QUESTIONS? JUST ASK

Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00 (UK time).

Call us+44 330 133 3748
Email us[email protected]

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.

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.

You might also like

RELATED PARTS

ONE WAY CLUTCH BEARING KIT ALLBALLS 25-1782 CAN-AM 420427220 420832351

ONE WAY CLUTCH BEARING KIT ALLBALLS 25-1782 CAN-AM 420427220 420832351

$40.78
RUBBER KICKSTART 14x25x65mm

RUBBER KICKSTART 14x25x65mm

$1.70
PISTON KIT VERTEX 66.4 B KAWASAKI KX/KXE 250 02-04, VERTEX 22795B

PISTON KIT VERTEX 66.4 B KAWASAKI KX/KXE 250 02-04, VERTEX 22795B

$181.23

Trade pricing available

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

Apply for Trade
1