PISTON KIT VERTEX 79.0 YAMAHA WR/YZ 250 01-14, VERTEX 23127200 OS +2.00 BIG BORE COMPR 12,5:1
4.1 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
Vertex UK piston kit. Standard pistons and components are OEM replacements. Kits include piston, rings, wrist pin, and circlips. All pistons are heat treated with a T-5 or T-6 hardening and tempering cycle. Replacement rings are sold individually. Made in Italy. Fitted in many OEM bikes as STD. Bore size 79.00mm, oversize +2.00 [a 78.96mm]. Big Bore Compr. 12.5:1. Replacement parts: Rings 590379000001 SET, Pin 715381, Clips 72055. Cross reference numbers: Piston (Std) 5NL-11631-20-00, Piston Ring Set (Std) 5NL-11603-00-00, Pin, Piston 5NL-11633-00-00, Circlip 93420-16086-00.
- SKU
- 23127200
- Brand
- Vertex
- Availability
- In Stock (1)
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- General Size
- 79.00mm
- Variant Id
- 282674
FULL DESCRIPTION
Vertex Piston Kit Big Bore 79.00mm Oversize +2.00
This Vertex Piston Kit is designed for high-performance applications, offering an oversized 79.00mm bore size. It features a compression ratio of 12.5:1, ideal for boosting power and torque.
All Vertex Pistons are manufactured in Italy and undergo a T-5 or T-6 hardening and tempering cycle for enhanced durability and performance. This kit is built to meet or exceed OEM specifications and is supplied with all necessary components for installation.
Key Features:
- Oversize Bore: 79.00mm (specifically 78.96mm) for a +2.00 oversize application.
- High Compression Ratio: 12.5:1 for increased engine performance.
- Complete Kit: Includes piston, rings, wrist pin, and circlips.
- Durable Construction: Pistons are heat-treated with a T-5 or T-6 hardening and tempering cycle.
- OEM Quality: Vertex pistons are fitted as standard equipment on many OEM motorcycles.
- Made in Italy: Ensures high-quality manufacturing standards.
Replacement parts such as rings, pins, and clips are also available separately.
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.