Piston Kit 99-08 Trx Xr 87.50, Forged Wossner 8702D250 400

Wössner forged piston kit with an 87.50mm bore, designed for Honda TRX400EX and TRX400X ATVs. Manufactured in Germany, 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
• Made in Germany

Specifications

• Bore: 87.50mm (87.44mm actual)
• Display: 397 cm³
• Stroke: 70.00mm
• Clearance: 0.06mm
• Wössner Compression Ratio: 12.50:1
• OEM Compression Ratio: 10.00:1
• Dome Volume: +8.40 cm³
• Compression Height: 26.20mm

Cross-Reference OEM Part Numbers

• Wössner Piston: 8702D250
• Lock: CW20
• Pin: WP052
• Ring Set: 875XSY
• Rod: P4021

Vehicle Fitments

• Honda TRX400EX (1999-2008)
• Honda TRX400X (2009-2012)

Dispatch Times

Local Stock: Dispatches in < 24 hours

Parts showing as available at our Warehouse in Gorey ship the same business day if ordered before 1pm. 

Supplier Stock: Dispatches in 2-4 Days

Parts showing as available at our Supplier Warehouse are ordered from our supplier and delivered to us before we can dispatch. More info is available on this page under "Stock Availability".

OEM Special Order: Dispatches in 3-10 Days

This website does not have access to live stock levels from our OEM Suppliers. In most cases the parts will be available but in the case of backordered parts we will notify you. We receive parts from Yamaha in 3-4 days, All others including Honda, Suzuki, Kawasaki, Polaris please allow 7-10 days for us to receive the parts. 

Delivery Times

Ireland & Northern Ireland:

1-2 Days using GLS/An Post

Germany, France, Netherlands, Belgium:

3-5 Days using GLS/Fedex

Italy, Spain & Other EU Countries:

4-7 Days using GLS/Fedex