PISTON KIT 99-08 TRX XR 87.50, FORGED WOSSNER 8702D250 400
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 87.50mm 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 include forged construction for superior strength and durability, optimized heat transfer to cylinder walls, elliptical design for uniform bearing surface under heat expansion, and increased compression ratio for improved engine performance. Made in Germany. Specifications: Bore: 87.50mm (87.44mm actual), Display: 397 cm³, Stroke: 70.00mm, Clearance: 0.06mm, Wossner Compression Ratio: 12.50:1, OEM Compression Ratio: 10.00:1, Dome Volume: +8.40 cm³, Compression Height: 26.20mm. Wossner Piston part number: 8702D250.
- SKU
- 56-W4628_250.WO
- Brand
- Wossner
- Availability
- In Stock (2)
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- General Size
- 87.5mm
- Variant Id
- 255790
FULL DESCRIPTION
Wossner Forged Piston Kit 87.50mm for Honda TRX 400
Upgrade your Honda TRX400EX or TRX400X with this high-performance forged piston kit from Wossner. Engineered in Germany, this piston offers exceptional strength, improved heat transfer, and enhanced durability for demanding off-road applications. The innovative elliptical design ensures even distribution of bearing surface pressure, even under extreme heat, preventing premature wear and potential piston collapse.
Key Features:
- Forged construction for superior strength and longevity
- Optimized for efficient heat transfer to the cylinder walls
- Elliptical piston design promotes uniform bearing surface distribution
- Increases compression ratio for noticeable performance gains
- Precision manufactured in Germany
Specifications:
- Bore: 87.50mm (actual 87.44mm)
- Displacement: 397 cm³
- Stroke: 70.00mm
- Clearance: 0.06mm
- Wossner Compression Ratio: 12.50:1
- OEM Compression Ratio: 10.00:1
- Dome Volume: +8.40 cm³
- Compression Height: 26.20mm
Includes:
- Wossner Piston: 8702D250
- Lock: CW20
- Pin: WP052
- Ring Set: 875XSY
- Rod: P4021
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.