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Wiseco K1039 Forged Piston Top End Kit 75.50mm Bore 11:1 CR Kawasaki GPz1000RX Ninja GTR1000

(1986-2000 Kawasaki ZG1000 Concours; 1986-1987 Kawasaki ZX1000 Ninja 1000R)

Manufacturer

Picture for manufacturer Wiseco Pistons

Part Number

K1039
10 reviews
Sale Price

$844.99

Estimated ship date Friday, November 27

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Product Details

The Wiseco K1039 is a complete forged top end piston kit engineered for the Kawasaki GPz1000RX Ninja and GTR1000 (1986–2000). This kit delivers a 1.50mm oversize bore of 75.50mm (up from the stock 74.00mm) and an 11:1 compression ratio, making it ideal for engine rebuilds, overboring worn cylinders, or extracting additional performance from the 1039cc inline-four powerplant. Note: Cylinder boring is required for installation.

What's Included:

  • Forged aluminum piston(s) — Part No. 4413M07550
  • High-performance ring set — Part No. 2973XG (75.50mm)
  • 18mm alloy wrist pin — Part No. S278 (18mm x 2.472" non-chromed)
  • Round wire pin locks / circlips — Part No. CW18 (18mm, pair)
  • Top end head gasket — Part No. W3885 (Kawasaki GPZ900/1000R)

Key Specifications:

  • Bore Size: 75.50mm (+1.50mm oversize)
  • Stock Bore: 74.00mm
  • Stroke: 58.00mm
  • Displacement: 1039cc
  • Compression Ratio: 11.0:1
  • Wrist Pin Diameter: 18mm

Wiseco Forged Advantage:

  • Forged from high-silicon, low-expansion aerospace-grade aluminum for superior strength and reduced weight
  • The forging process aligns grain flow and increases alloy density, improving resistance to impact, fatigue, and heat
  • Diamond-turned CNC finish guarantees precision sizing with no variation across cylinders
  • Compatible with cast iron, chrome, Nikasil, and boron composite cylinder bore compositions
  • Engineered and manufactured in the USA

The Wiseco K1039 top end kit provides everything needed to complete a professional-quality piston rebuild in one convenient package, restoring or improving engine performance with components that meet and exceed OEM standards.

Products specifications

Fits

1986-2000 Kawasaki ZG1000 Concours; 1986-1987 Kawasaki ZX1000 Ninja 1000R

Piston Material

2618

Prop 65

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Bore Diameter

75.50

Engine Type

ICE

Product Type

Engine Piston Kit

Industry

Powersports

Out of Stock Message

Estimated Shipped Date 3-4 Weeks

EBAY Category ID

177976

Product Series

4 Stroke Forged Series

Product Market

Street

Skirt Coating

No

Compression Ratio Actual

11:1

Piston Diameter

75.45

Piston oversize

1.50

Title

Wiseco 4 Stroke Forged Series Piston Kit, 75.50 MM Bore, 11:1 CR

Included Components

Piston #4413M07550, Ring Set #2973XG, Wrist Pin #S278, CirClip #CW18, Gasket #W3885

Title - Web

Kawasaki ZG1000/ZX1000 Wiseco Top End Kit - 75.50 mm Bore

Comments

Kit includes: (4) Pistons, Ring Sets, Piston Pins, Retainer Clips, and (1) CFM20 Head Gasket Cylinde

Shopping good on ordering we will see how product arrives and the quality when it gets here.

Great home page!

Lowest pricing. very simple process from start to checkout. A+++

Good

No problems so far

Love the price

OK

It was easy but shipping could be cheaper

competitive price and shipping cost

Loved it

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