PISTON KIT 08-09 WR250X 77 HC, FORGED WOSSNER 8772DB
4.1 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
Wossner forged piston kit with a 77.01mm bore and 76.97mm diameter. This Pro Series piston is engineered for high performance, featuring superior strength and design. Manufactured in Germany, it ensures optimal heat transfer to cylinder walls. Its elliptical design provides a uniform bearing surface under heat expansion, reducing localized pressure and evenly distributing thrust loads to prevent piston collapse. Features include forged construction for superior strength, optimized heat transfer for efficient combustion, elliptical design for uniform load distribution, and high compression ratio for increased performance. Specifications: Bore: 77.01mm, Diameter: 76.97mm, Display (cm³): 249, Stroke (mm): 53.60, Clearance (mm): 0.04, Wossner Compression Ratio: 13.50:1, OEM Compression Ratio: 11.80:1, Dome Volume (cm³): -4.50, Compression Height (mm): 22.20. Cross-Reference OEM Part Numbers: Wossner Piston Yamaha WR250X (PN# 8772DB), Lock P/N: CW17, Pin P/N: WP083, Ring Set P/N: 770XAS-2.
- SKU
- 56-W239.B.WO
- Brand
- Wossner
- Availability
- In Stock (2)
Fitments (5)
| Make | Model | Year |
|---|---|---|
| YAMAHA | WR X 250 | 2008 |
| YAMAHA | WR X 250 | 2009 |
| YAMAHA | WR X 250 | 2010 |
| YAMAHA | WR X 250 | 2011 |
| YAMAHA | WR X 250 | 2012 |
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- General Size
- 77mm
- Variant Id
- 255152
FULL DESCRIPTION
Wossner 77mm Forged Piston Kit for WR250X
Enhance the performance of your motorcycle with this Wossner Pro Series forged piston kit. Engineered in Germany, this high-performance piston boasts superior strength and advanced design for optimal engine operation.
The piston features an elliptical design that ensures a uniform bearing surface even under the extreme conditions of heat expansion. This innovative design minimizes localized pressure and evenly distributes thrust loads, effectively preventing piston collapse and extending engine life.
Key Features:
- Forged construction for exceptional durability and strength.
- Designed for optimal heat transfer to the cylinder walls, promoting efficient combustion.
- Elliptical piston shape for uniform load distribution under thermal stress.
- Achieves a high compression ratio for a significant boost in performance.
- Precision manufactured in Germany to exacting standards.
Specifications:
- Bore: 77.01mm
- Diameter: 76.97mm
- Display (cm³): 249
- Stroke (mm): 53.60
- Clearance (mm): 0.04
- Wossner Compression Ratio: 13.50:1
- OEM Compression Ratio: 11.80:1
- Dome Volume (cm³): -4.50
- Compression Height (mm): 22.20
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00 (UK time).
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.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.