PISTON KIT XR400 TRX400 89.00, FORGED WOSSNER 8604D400
4.1 Trustpilot 99.9% positive on eBay
Free UK delivery 2–4 business days
Spread the cost with 
18+, T&Cs apply
Wossner forged piston kit with an 89mm bore. This high-performance piston enhances strength, heat transfer, and durability. The elliptical design ensures uniform bearing surface distribution, reducing localized pressure and preventing piston collapse. Features forged construction for superior strength and durability, optimized heat transfer to cylinder walls, elliptical design for uniform bearing surface under heat expansion, increased compression ratio for improved engine performance, and is made in Germany. Specifications include a bore of 89mm (88.94mm actual), display of 397 cm³, stroke of 70.00mm, clearance of 0.06mm, Wossner Compression Ratio of 11.00:1, OEM Compression Ratio of 10.00:1, dome volume of +3.20 cm³, and compression height of 26.20mm. Cross-reference OEM part numbers include Wossner Piston: 8604D400, Lock: CW20, Pin: WP052, Ring Set: 890XSY, and Rod: P4021.
- SKU
- 56-W4606+400.WO
- Brand
- Wossner
- Availability
- In Stock (1)
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- General Size
- 89mm
- Variant Id
- 255777
FULL DESCRIPTION
Wossner Forged Piston Kit 89mm for XR400 TRX400
Upgrade your motorcycle or ATV engine with this high-performance Wossner forged piston kit. Engineered in Germany for superior strength and durability, this piston is designed to enhance your engine's performance and longevity. The advanced forged construction offers improved heat transfer to the cylinder walls and increased resistance to wear.
Featuring an innovative elliptical design, this piston ensures uniform bearing surface distribution, even under extreme heat. This reduces localized pressure points and effectively prevents piston collapse, leading to a more reliable and powerful engine operation.
Key Features:
- Forged aluminum construction for exceptional strength and durability.
- Optimized heat dissipation for efficient cylinder wall cooling.
- Elliptical piston skirt design for balanced load distribution and reduced wear.
- Increases engine compression ratio for enhanced power output.
- Precision manufactured in Germany to exacting standards.
Specifications:
- Bore Size: 89mm (88.94mm actual)
- Displacement: 397 cc
- Stroke: 70.00mm
- Piston Clearance: 0.06mm
- Wossner Compression Ratio: 11.00:1
- Dome Volume: +3.20 cc
- Compression Height: 26.20mm
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00.
Call or email us with your make, model and year and we will check it for you before you order.
UK delivery is £4.99, or free on orders over £60. Orders ship within 3 working days, then delivery takes 2–4 business days. 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.
More answers in our FAQ.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.