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Wiseco 478M08750 Pro-Lite Forged Piston Kit Bore - 2-Stroke 87.50mm

(1983-1984 Yamaha IT490; 1982-1983 Yamaha YZ490)

Manufacturer

Picture for manufacturer Wiseco Pistons

Part Number

478M08750
13 reviews
Sale Price

$219.99

Estimated ship date Wednesday, November 25

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Live-in-stock inventory

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Fitment guaranteed

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Product Details

The Wiseco 478M08750 is a high-performance forged piston kit with an 87.50mm bore designed for 2-stroke off-road engines. Built from 4032 high-silicon aluminum alloy, this piston delivers superior strength, reduced weight, improved heat transfer, and extended service life compared to cast alternatives.

Key Features:

  • Forged 4032 aluminum construction — high-silicon, low-expansion alloy optimizes tensile strength and long-term durability
  • CNC diamond-turned finish — precision machining ensures consistent sizing with zero variation across the piston skirt
  • Compatible with all cylinder bore types — suitable for cast iron, chrome, Nikasil, and boron composite cylinder compositions
  • Oversize fitment — 87.50mm bore supports cylinder rebuilds and extends the life of worn cast iron lined cylinders
  • Engineered and manufactured in the USA — forged and machined at Wiseco's facility in Mentor, OH
  • Dedicated 2-stroke forging — designed specifically for 2-stroke powersports engines with an optimized strength-to-weight ratio

Kit Includes:

  • Forged piston
  • Piston ring(s)
  • Wrist pin
  • Circlips

With over 80 years of piston engineering experience, Wiseco's Classic Forged piston kits are a trusted choice for both competitive racers and recreational riders seeking reliable, high-performance engine components.

Products specifications

Fits

1983-1984 Yamaha IT490; 1982-1983 Yamaha YZ490

Piston Material

4032

Prop 65

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

Bore Diameter

87.50

Engine Type

ICE

Product Type

Engine Piston Kit

Industry

Powersports

Out of Stock Message

Estimated Shipped Date 3-4 Weeks

EBAY Category ID

177976

Piston oversize

0.50

Product Series

2 Stroke Forged Series

Skirt Coating

No

Product Market

Dirt Bike

Title

Wiseco 2 Stroke Forged Series Piston Kit, 87.50 MM Bore

Piston Diameter

87.42

Included Components

Ring Set #3445TD, Wrist Pin #S277, CirClip #CW18

Title - Web

Yamaha YZ490/IT490 Wiseco Piston Kit - 87.50 mm Bore

Quick and easy payment

Quick and easy

Good

Nice customer service. Solved my issues but took a day and half to be reimbursed from canceled order. Still will use to part more parts. Thanks

It was very easy to navigate your web site to find the part that I need.

smooth experience

Best price, free shipping, no tax. Nothing more I could want at this step. Received in perfect condition, well packaged, fast shipping

Very easy to order , not to shabby.

Item arrived quickly and as described. Thanks

Very simple & fast.

Good

Easy to find what I neededpart worked perfectly.

I was looking for some new lowering springs for my Integra and after looking around I found this place to be the best price around. It got here a week later which didn't seem to bad. Got the tracking info after 2days. Overall it was great shopping experience. They helped me and replied quick to the questions I had.

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