2Bros Parts

PISTON KIT 77.00mm 2005-2013 YAMAHA YZF 250 NAMURA FORGED FX-40033

$147.77

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Delivery to United States 5–8 business days

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Forged aluminum piston kit, 77.00 mm standard bore. Features a hard-anodised crown for improved heat resistance and reduced carbon build-up, and a MOS2 low-friction skirt coating for reduced friction and aided running-in. The 100% CNC-machined dome ensures a consistent combustion shape. Supplied complete for one cylinder, including piston, ring set, wrist pin, and circlips. Specifications include a 13.5:1 compression ratio and 4-stroke single, DOHC, 5-valve engine type. Typical engine stroke is 53.6 mm. Manufacturer part number FX-40033.

Specifications
SKU
56-W9702.A.NF
Brand
Namura Technologies
Availability
In Stock (9)

Fitments (47)

MakeModelYear
GAS-GASEC F 2502010
GAS-GASEC F 2502011
GAS-GASEC F 2502012
GAS-GASEC F 2502013
GAS-GASEC F 2502014
GAS-GASEC F 2502015
YAMAHAWR 250F2005
YAMAHAWR 250F2006
YAMAHAWR 250F2007
YAMAHAWR 250F2008
YAMAHAWR 250F2009
YAMAHAWR 250F2010
YAMAHAWR 250F2011
YAMAHAWR 250F2012
YAMAHAWR 250F2013
YAMAHAWRF 2502005
YAMAHAWRF 2502006
YAMAHAWRF 2502007
YAMAHAWRF 2502008
YAMAHAWRF 2502009
YAMAHAWRF 2502010
YAMAHAWRF 2502011
YAMAHAWRF 2502012
YAMAHAWRF 2502013
YAMAHAYZ 250F2005
YAMAHAYZ 250F2006
YAMAHAYZ 250F2007
YAMAHAYZ 250F2008
YAMAHAYZ 250F2009
YAMAHAYZ 250F2010
YAMAHAYZ 250F2011
YAMAHAYZ 250F2012
YAMAHAYZ 250F2013
YAMAHAYZ 250F2014
YAMAHAYZ 250F2015
YAMAHAYZ 250F2016
YAMAHAYZ 250F2017
YAMAHAYZ 250F2018
YAMAHAYZF 2502005
YAMAHAYZF 2502006
YAMAHAYZF 2502007
YAMAHAYZF 2502008
YAMAHAYZF 2502009
YAMAHAYZF 2502010
YAMAHAYZF 2502011
YAMAHAYZF 2502012
YAMAHAYZF 2502013
General Product Group
Engine
General Product Type
Pistons & Kits
General Size
77.00mm
Variant Id
258488
Delivery5–8 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

Namura Forged Piston Kit - 77.00mm Bore

This Namura forged piston kit is engineered for high-performance replacements and routine engine rebuilds. Designed for a precise fit, it ensures optimal combustion and durability under demanding conditions.

Key Features

  • Forged Aluminum Construction: Provides exceptional strength and resistance to thermal load for enhanced longevity.
  • Hard-Anodised Crown: Improves heat resistance and minimizes carbon deposit formation, maintaining peak performance.
  • MOS2 Skirt Coating: Molybdenum disulfide coating reduces friction, aids in the running-in process, and promotes smoother operation.
  • 100% CNC Machined Dome: Ensures a consistent and accurate combustion chamber shape for optimized power delivery.
  • Complete Kit: Supplied with all necessary components for a single cylinder, including the piston, ring set, wrist pin, and circlips.

Specifications

  • Bore Size: 77.00 mm (Standard)
  • Compression Ratio: 13.5:1
  • Engine Type: 4-stroke single, DOHC, 5-valve
  • Kit Contents: Piston, rings, wrist pin, circlips for one cylinder
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.

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