Piston Kit 84-85 Cr250 66.50, Wossner 8156D050 Honda Mx

This Wossner piston kit is built for Honda CR250R and ATAC250 models from 1984 to 1985, featuring a 66.50 mm bore with an actual piston diameter of 66.44 mm. Forged in Germany, it is designed for strength and efficient thermal performance, promoting effective heat transfer from the combustion chamber to the cylinder walls. The piston’s elliptical profile ensures uniform bearing contact during thermal expansion, helping to distribute thrust loads evenly and reduce the risk of piston failure.

Features

• Forged piston for increased structural integrity

• Engineered for optimal heat transfer efficiency

• Elliptical shape reduces localised pressure under heat expansion

• Manufactured in Germany

Specifications

• Bore size: 66.50 mm

• Actual piston diameter: 66.44 mm

• Display (cm³): 246

• Stroke: 72.00 mm

• Clearance: 0.06 mm

• Compression height: 38.00 mm

• Wossner compression ratio: 2-stroke

• OEM compression ratio: 2-stroke

Cross-Reference OEM Part Numbers

• Wossner Piston Part Number: 8156D050

• Lock Part Number: CW18

• Pin Part Number: WP033

• Ring Set Part Number: RSB6650 x2

• Alternate Part Number: 56-W526.P2.WO

Vehicle Fitments

• Honda CR250R 1984

• Honda CR250R 1985

• Honda ATAC250 1984

• Honda ATAC250 1985

• Honda ATC250R 1985

• Honda ATC250R 1986

• Honda TRX250R 1985

• Honda TRX250R 1986

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