Piston Kit 87-90 Trx250 67.00, Wossner 8189Da Honda Atv

Wossner forged piston kit for Honda ATC250R and TRX250R models from 1987 to 1990, featuring an oversize bore of 67.00 mm (+1.00 mm). Engineered for demanding 2-stroke performance, this piston utilises a forged construction and an elliptical profile to manage heat expansion effectively. This design helps distribute thrust loads evenly and minimise stress concentrations, ensuring long-lasting engine reliability. Manufactured in Germany to exacting standards.

Features

• Forged piston for high strength and thermal resistance

• Optimised for effective heat transfer from combustion chamber to cylinder wall

• Elliptical design provides uniform expansion and prevents localised pressure

• Intended for high-performance 2-stroke engine use

• Made in Germany

Specifications

• Bore: 67.00 mm

• Actual Bore Diameter: 66.94 mm

• Compression Height: 33.00 mm

• Display Volume: 246 cm³

• Stroke: 72.00 mm

• Clearance: 0.06 mm

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

Cross-Reference OEM Part Numbers

• Piston Kit Part No.: 8189D100

• Lock P/N: CW18

• Pin P/N: WP033

• Ring Set P/N: RSB6700 (x2)

• Alternate Part No.: 56-W562.P4.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