2Bros Parts

PISTON 98-00 YZF/WR400F 92 HC, WOSSNER PISTON KIT 8639DB

$195.20

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Delivery to United States 5–8 business days

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Wossner 92mm high compression forged piston kit. Engineered for optimal heat transfer and efficient combustion. Features an elliptical design to prevent piston collapse and evenly distribute thrust loads. Manufactured in Germany. Bore Size: 92.01mm, Actual Bore Diameter: 91.96mm, Displacement: 399 cm³, Stroke: 60.10mm, Clearance: 0.05mm, Wossner Compression Ratio: 13.50:1, OEM Compression Ratio: 12.50:1, Dome Volume: -4.60 cm³, Compression Height: 24.10mm. Includes lock part number CW18, pin part number WP053, and ring set part number 920XSY.

Specifications
SKU
56-W199+00B.WO
Brand
Wossner
Availability
In Stock (2)
General Product Group
Engine
General Product Type
Pistons & Kits
General Size
92mm
Variant Id
254960
Delivery5–8 business days
14-Day ReturnsHassle-free
Easy CheckoutCard friendly
Product details

FULL DESCRIPTION

Wossner High Compression Forged Piston Kit - 92mm Bore

Enhance your engine's performance with this Wossner forged piston kit, engineered for high compression and superior power output. This piston is meticulously designed for optimal heat transfer to the cylinder walls, ensuring efficient combustion and consistent engine operation.

The innovative elliptical design of the piston provides a uniform bearing surface even under extreme heat expansion. This feature significantly reduces localized pressure points and evenly distributes thrust loads, effectively preventing piston collapse and extending engine life.

Manufactured in Germany to exacting standards, this Wossner piston kit represents the pinnacle of quality and engineering for performance-driven engines.

Key Features

  • High-compression forged piston for maximum performance gains.
  • Engineered for optimized heat transfer, promoting efficient combustion.
  • Elliptical design prevents piston collapse by managing heat expansion and load distribution.
  • Precision manufacturing in Germany ensures exceptional quality and durability.

Specifications

  • Bore Size: 92.01mm
  • Actual Bore Diameter: 91.96mm
  • Displacement: 399 cm³
  • Stroke: 60.10mm
  • Piston Clearance: 0.05mm
  • Wossner Compression Ratio: 13.50:1
  • OEM Compression Ratio: 12.50:1
  • Dome Volume: -4.60 cm³
  • Compression Height: 24.10mm

Included Components

  • Lock Part Number: CW18
  • Pin Part Number: WP053
  • Ring Set Part Number: 920XSY
Before you buy

QUESTIONS? JUST ASK

Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00 (UK time).

Call or email us with your make, model and year 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.

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