KTM SX 250 2005 GRADE B 66.35mm TWIN RING PISTON
4.4 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
Vertex pistons are manufactured using Low-Ex Silicon aluminium alloys (12%, 18% or 21% depending on application). They are made using a gravity cast or hydraulic forging process, with material structure refined by a hi-tech Heat Treatment process. The machining is completed using CNC machines and diamond tools, allowing for specific surface finishes. Each Vertex piston undergoes manual and automatic quality control. Vertex pistons are coated with a special Molybdenum Bisulphite black coating for break-in and friction reduction. A new Phosphate Coating is also available, offering increased hardness and light surface porosity for superior adhesion and durability. This piston has a bore of 66.35mm and features twin rings.
- SKU
- V.3121B
- Brand
- Vertex
- Availability
- In Stock (1)
- SKU
- V.3121B
- Brand
- Vertex
- Availability
- In Stock (1)
FULL DESCRIPTION
Vertex 66.35mm Grade B Twin Ring Piston
Maintain peak engine performance with the Vertex 66.35mm Grade B Twin Ring Piston. Engineered for reliability and precision, this piston utilizes advanced manufacturing techniques to ensure durability and optimal power delivery under demanding conditions.
Vertex pistons are crafted from high-quality, low-expansion silicon-charged aluminum alloys. This material choice, combined with precise heat treatment processes, ensures structural integrity and consistent performance throughout the life of the component. The machining is performed on state-of-the-art CNC equipment, utilizing diamond tooling to achieve exact surface finishes tailored to the requirements of your engine.
Key Features
- Advanced Alloy Construction: Manufactured using Low-Ex silicon-charged aluminum for superior thermal stability and strength.
- Precision Engineering: CNC machined with high-tech diamond tools to ensure exact dimensions and optimal sealing.
- Twin Ring Design: Engineered to provide an effective seal and heat transfer path for consistent power output.
- Enhanced Surface Coatings: Features a Molybdenum Bisulphite coating to assist in the break-in process and reduce internal friction.
- Phosphate Coating Technology: Integrated all-over phosphate coating provides increased surface hardness and superior adhesion for the Molybdenum layer, significantly extending the durability of the piston.
- Strict Quality Control: Every piston undergoes rigorous manual and automatic inspection to meet high manufacturing standards.
This Grade B piston is designed to offer a precise fit, ensuring that your engine maintains the compression and performance characteristics required for competitive riding and reliable operation.
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.