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1992 Yamaha YZ80

Wiseco 2-Stroke Piston - .020" Oversize

$114.99
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FITS: 1992 Yamaha YZ80 change
 
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Product Description

Important note: This oversized piston is 0.020" larger than stock. Please measure your cylinder to check clearance before ordering.

Wiseco leads the performance aftermarket by producing the highest quality forged pistons in the U.S.A. Wiseco is unique because they forge all of their own pistons in-house, and produce all of their own forge tooling in the U.S.A. This allows Wiseco to control all aspects of their manufacturing process from raw bar to skirt coating on the finished parts.

Extreme racing conditions demand the strength and toughness that only forged pistons can offer. Compared to cast pistons, forgings are tougher and more durable, and will stand up to the abuse that high performance motorsport applications require. Most castings are brittle, have no grain structure and tend to fail catastrophically when the material yield strength is exceeded. Forgings have condensed grain that is aligned to the features of the part, which produces higher mechanical properties, and resistance to impact and fatigue. Each forging is designed to optimize the strength-to-weight ratio, and maximize performance.

  • Much stronger than stock.
  • Tight tolerances for quiet running.
  • More hours with peak performance between piston changes.
  • All pistons include rings, wrist pin and circlips.
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Total Questions (3)
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1-3 of 3
Gilly Over 3 years ago
What is the original size piston on a1982 yamaha yz 490 j?
original bore
MotoSport Staff Expert
Over 3 years ago Location: Portland, OR
According to Wiseco, the stock bore for an 82-83 YZ490 J,K and 83-84 IT490 is 87mm bore with an 82mm stroke. The Wiseco piston number is: 478PS. Hope that helps.
TRICK420 Over 3 years ago Location: 46356
I HAVE A 1983 KX125 THAT NEEDS A NEW PISTON AND RINGS AND THE OLD PISTON I TOOK OUT HAS A 020 MARKED ON THE TOP AND THE OD OF THE PISTON READS 56.20 M?
DOES THAT MEANS IT BORED 20 OVER AND WHAT PISTON WOULD I N EED
Expert MotoSport Staff
Over 3 years ago Location: Portland, OR
To be 100% sure you receive the correct piston I'd suggest to mic the cylinder in mm. From the info you state in the question, 56.20 is not the what I show as the piston size for .020. Wiseco and OEM show .020 over stock would be 56.5mm and stock bore is 56mm.
night Over 5 years ago
Does the Wiseco Piston .020" oversize come with the rings cylinder and piston all in one for the price of 97.99?
I just really need to know if it comes with the piston cause in the picture it show rings and cylinder but no piston
MotoSport Staff Expert
Over 5 years ago
This will only include the piston, rings, pin and the clips only.
1-3 of 3

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