2Bros Parts

PISTON KIT 98-01 YZ125 54.00 B, WOSSNER 8091DB YAMAHA MX

£115.06

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Free UK delivery 2–4 business days

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Wossner 54.01mm bore piston kit for Yamaha YZ125 and WR125 models. Forged construction ensures durability for high thermal and mechanical loads in two-stroke engines. Features superior heat transfer design and an elliptical shape for even load distribution. Specifications include a 54.01mm bore size, 53.96mm actual piston size, 125 cm³ displacement, 54.50mm stroke, 0.05mm clearance, 2-stroke compression ratio, 28.00mm compression height. Includes piston, lock PN# CW15, pin PN# WP032, ring set PN# RSB5400, and rod PN# P2019. Manufactured in Germany.

Specifications
SKU
56-W726.B.WO
Brand
Wossner
Availability
Out of Stock

Fitments (12)

MakeModelYear
GAS-GASMC 1252000
GAS-GASMC 1252001
GAS-GASMX 1252000
GAS-GASMX 1252001
GASGASEC 1252000
GASGASEC 1252001
YAMAHAYZ 1251996
YAMAHAYZ 1251997
YAMAHAYZ 1251998
YAMAHAYZ 1251999
YAMAHAYZ 1252000
YAMAHAYZ 1252001
General Product Group
Engine
General Product Type
Pistons & Kits
General Size
54.00mm
Variant Id
257554
Delivery2–4 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

Wossner Piston Kit for Yamaha YZ125/WR125 (1998-2001)

Upgrade your Yamaha YZ125 or WR125 engine with this high-performance Wossner piston kit. Engineered in Germany, this forged piston is designed to withstand the extreme thermal and mechanical demands of high-performance two-stroke applications. The advanced design ensures reliable operation and optimal power delivery for your motorcycle.

Key Features:

  • High-strength forged piston construction for enhanced durability.
  • Superior heat transfer design efficiently moves heat from the combustion chamber to the cylinder wall.
  • Elliptical piston shape promotes even load distribution and minimizes piston distortion under stress.
  • Precision manufacturing in Germany guarantees exceptional quality and performance.

Specifications:

  • Bore Size: 54.01 mm
  • Actual Piston Size: 53.96 mm
  • Displacement: 125 cm³
  • Stroke: 54.50 mm
  • Clearance: 0.05 mm
  • Compression Ratio: 2-stroke (compatible with Wossner and OEM specifications)
  • Compression Height: 28.00 mm

Included Components:

  • Piston: Wossner PN# 8091DB
  • Lock: PN# CW15
  • Pin: PN# WP032
  • Ring Set: PN# RSB5400
  • Rod: PN# P2019
Before you buy

QUESTIONS? JUST ASK

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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.

UK delivery is £4.99, or free on orders over £60. Orders ship within 3 working days, then delivery takes 2–4 business days. 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

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Out of stock