Piston Kit 87-90 Trx250 66.00, Wossner 8189Da Honda Atv

Wossner forged piston kit for Honda ATC250R and TRX250R models from 1987 to 1990, featuring a standard bore size of 66.00 mm. This piston is engineered for high-performance 2-stroke engine applications and designed to withstand thermal and mechanical stress. Its elliptical design provides even expansion, reducing localised pressure and enhancing durability. Manufactured in Germany with high-precision standards.

Features

• Forged piston construction for enhanced strength and reliability

• Designed to improve heat transfer from combustion chamber to cylinder wall

• Elliptical profile for even bearing contact during thermal expansion

• Engineered for 2-stroke engines

• Made in Germany

Specifications

• Bore: 66.00 mm

• Actual Bore Diameter: 65.94 mm

• Compression Height: 45.00 mm

• Display Volume: 246 cm³

• Stroke: 86.00 mm

• Clearance: 0.09 mm

• Compression Ratio: 2-stroke (Wossner and OEM)

Cross-Reference OEM Part Numbers

• Piston Kit Part No.: 8189DA

• Lock P/N: CW18

• Pin P/N: WP033

• Ring Set P/N: RSB6600 (x2)

• Alternate Part No.: 56-W562.P0.WO

Vehicle Fitments

• Honda ATC250R (1987–1990)

• Honda TRX250R (1987–1990)

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