PISTON KIT 02-04 YZ125 54.00 C, WOSSNER 8072DC YAMAHA MX
4.1 Trustpilot 99.9% positive on eBay
Delivery to United States 5–8 business days
Spread the cost with 
Wossner forged piston kit with a 54.02mm bore and 53.96mm actual piston diameter. This piston kit features a +0.02mm oversize for Yamaha YZ125 models. Engineered for reliable performance, enhanced heat transfer, and structural stability in 2-stroke engines. Includes forged piston, elliptical profile for consistent bearing surface during thermal expansion, even thrust load distribution to prevent piston collapse and reduce localised stress. Manufactured in Germany. Specifications: Bore: 54.02mm, Piston Diameter: 53.96mm, Display (cm³): 125, Stroke (mm): 54.50, Clearance (mm): 0.06, Compression Height (mm): 28.00. Cross-Reference OEM Part Numbers: 5NY-11631-01-D0, 5NY-11631-01-C0, 5NY-11631-01-B0, 5NY-11631-01-A0, Ring: 5NY-11611-00-00, Pin: 5UN-11633-00-00, Circlip: 93450-16068-00. Included Components: Lock: CW15, Pin: WP032, Ring Set: RSB5400, Rod: P2017. Part Number: 56-W797.C.WO (Piston PN# 8072DC).
- SKU
- 56-W797.C.WO
- Brand
- Wossner
- Availability
- In Stock (1)
Fitments (8)
| Make | Model | Year |
|---|---|---|
| YAMAHA | YZ 125 | 1997 |
| YAMAHA | YZ 125 | 1998 |
| YAMAHA | YZ 125 | 1999 |
| YAMAHA | YZ 125 | 2000 |
| YAMAHA | YZ 125 | 2001 |
| YAMAHA | YZ 125 | 2002 |
| YAMAHA | YZ 125 | 2003 |
| YAMAHA | YZ 125 | 2004 |
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- General Size
- 54.0mm
- Variant Id
- 257778
FULL DESCRIPTION
Wossner Piston Kit 54.02mm Yamaha YZ125 2002-2004
This Wossner piston kit features a 54.02mm bore and 53.96mm actual piston diameter, designed for Yamaha YZ125 models. Engineered with a +0.02mm oversize, this forged piston delivers reliable performance, enhanced heat transfer, and structural stability in high-performance 2-stroke engines.
Key Features:
- Forged piston ensures exceptional strength and durability
- Engineered for effective heat transfer from the combustion chamber to cylinder walls
- Elliptical profile provides a consistent bearing surface during thermal expansion
- Even thrust load distribution prevents piston collapse and reduces localized stress
- Manufactured in Germany
Specifications:
- Bore: 54.02mm
- Piston Diameter: 53.96mm
- Display (cm³): 125
- Stroke (mm): 54.50
- Clearance (mm): 0.06
- Compression Height (mm): 28.00
- Wossner Compression Ratio: 2-stroke
- OEM Compression Ratio: 2-stroke
Cross-Reference OEM Part Numbers:
- 5NY-11631-01-D0
- 5NY-11631-01-C0
- 5NY-11631-01-B0
- 5NY-11631-01-A0
- Ring: 5NY-11611-00-00
- Pin: 5UN-11633-00-00
- Circlip: 93450-16068-00
Included Components:
- Lock: CW15
- Pin: WP032
- Ring Set: RSB5400
- Rod: P2017
- Part Number: (Piston PN# 8072DC)
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00 (UK time).
Check the fitment table on this page against your make, model and year. Not sure? Call or email us and we will check it for you before you order.
Yes. We ship from the UK. Orders ship within 3 working days, then delivery to the United States takes 5–8 business days. The delivery price is shown at checkout before you pay. 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.
Any customs duties or import taxes charged in the United States are paid by you when the parcel arrives. Any tax we collect ourselves is shown at checkout before you pay.
More answers in our FAQ.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.