PISTON KIT KTM 400 EXC 89.00, FORGED WOSSNER 8580DA 57530007000
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 89mm bore size (actual bore 88.94mm) and 398 cm³ displacement. Designed for high-performance applications, this piston offers superior strength and optimized heat transfer. The elliptical design ensures a uniform bearing surface under heat expansion, reducing localized pressure and preventing piston collapse. Manufactured in Germany for precision and durability. Specifications include a 64.00mm stroke, 0.06mm clearance, OEM compression ratio of 11.00:1, +7.00 cm³ dome volume, and 27.50mm compression height. Includes lock part number CW20, pin part number WP038, and ring set part number 890XSY. OEM cross-reference part number 57530007000. Part number 56-W4733+00A.WO.
- SKU
- 56-W4733+00A.WO
- Brand
- Wossner
- Availability
- In Stock (1)
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- General Size
- 89mm
- Variant Id
- 255980
FULL DESCRIPTION
Wossner Forged Piston Kit
Enhance the performance and durability of your engine with this premium Wossner forged piston kit. Engineered for high-performance applications, this piston offers superior strength and optimized heat transfer capabilities. Its unique elliptical design ensures uniform bearing surface distribution even under extreme heat expansion, effectively reducing localized pressure and preventing potential piston collapse for greater reliability.
Key Features:
- Forged construction provides exceptional strength and longevity.
- Designed for optimized heat transfer to cylinder walls, improving overall engine efficiency.
- Features an elliptical shape to ensure even thrust load distribution.
- Precision manufactured in Germany, guaranteeing high quality and dependable performance.
Specifications:
- Bore Size: 89.00mm
- Actual Bore: 88.94mm
- Display (cm³): 398
- Stroke (mm): 64.00
- Clearance (mm): 0.06
- Wossner Compression Ratio: OEM
- OEM Compression Ratio: 11.00:1
- Dome Volume (cm³): +7.00
- Compression Height (mm): 27.50
- Lock Part Number: CW20
- Pin Part Number: WP038
- Ring Set Part Number: 890XSY
Cross-Reference OEM Part Numbers:
- 57530007000
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.


