PISTON KIT SET/4 YZF1000 09-15, WOSSNER K8812DA-4 YAMAHA
4.1 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
Set of 4 forged Wossner pistons with part number K8812DA-4. Standard bore size is 78.00mm with an actual piston diameter of 77.96mm. These pistons feature an elliptical design for balanced pressure distribution under heat and are engineered for optimal combustion heat transfer. Manufactured in Germany. Specifications include a displacement of 1000cc (998cm³), stroke of 52.20mm, clearance of 0.04mm, OEM compression ratio of 12.70:1, dome volume of -3.30cm³, and compression height of 22.80mm. Includes cross-reference part numbers for clip (CW17), piston pin (WP083), and replacement ring set (780XAS).
- SKU
- 56-W9902.000.WO
- Brand
- Wossner
- Availability
- In Stock (1)
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- Variant Id
- 259119
FULL DESCRIPTION
Wossner Forged Piston Kit for Yamaha YZF1000 (2009-2015)
Enhance the performance and reliability of your Yamaha YZF1000 with this high-quality forged piston kit from Wossner. Engineered for the demanding requirements of the R1, this set of four pistons is designed to deliver exceptional power and durability.
Key Features:
- Set of four premium forged Wossner pistons.
- Designed for a standard 78.00mm bore size, with an actual piston diameter of 77.96mm.
- Features an innovative elliptical design to ensure balanced pressure distribution, even under extreme heat and load conditions.
- Optimized for efficient combustion heat transfer, promoting reliable engine operation.
- Manufactured in Germany to the highest standards of precision and quality.
- Maintains OEM compression characteristics while improving thermal resilience.
Specifications:
- Part Number: K8812DA-4
- Bore Size: 78.00mm
- Actual Piston Diameter: 77.96mm
- Displacement: 1000cc (998cm³)
- Stroke: 52.20mm
- Clearance: 0.04mm
- Wossner Compression Ratio: OEM
- OEM Compression Ratio: 12.70:1
- Dome Volume: -3.30cm³
- Compression Height: 22.80mm
Replacement Components:
- Clip: CW17
- Piston Pin: WP083
- Replacement Ring Set: 780XAS
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.