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Wiseco 2-Stroke Piston

Retail: $88.99 - $227.99
$37.77 - $189.99
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Wiseco 2-Stroke Piston

Product Description

Important note: This oversized piston is 0.050" 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.

Note: Image is for reference ONLY, actual contents will vary based on fitment.

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Location: I Live in Adams TN Race 25 times a year Vet AM
Wiseco top end set

Wiseco pistons are lighter, produce more power, last longer, and are cheaper than OEM. Using the Wiseco kits is a great way to go all the parts in one box! Take your time setting the ring gap thats as technical as it is!!! On a new bike as soon as it needs rings I swap the whole top end set, keeps it fresh with new with reliable parts.

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Location: oakland, ca

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jeff 4 months 18 days ago Location: ga
Need to order rings 2003 rm 124 w/ 58mm bore?
MotoSport Staff
4 months 18 days ago Location: Portland, OR, USA
If you give us a call we can provide pricing and availability of the 58mm rings for your 2003 RM125.
Nick Over 9 months ago Location: Illinois
What size rings do i need for a wiseco forged piston .02 over?
I purchsed a 1986 Kawasaki KX125 and it had a new wiseco forged piston. When i purchased the bike i was told it was bored .020 over already and the piston was new, but the guy ran out of money and didnt buy the rings. the piston is currently installed without the rings. I need to know what size rings goes with it. i keep getting conflicting information on the ring size. is it 56.0 or 56.5? HELP!
MotoSport Staff
Over 9 months ago Location: Portland, OR, USA
The correct rings for your .020" over piston would be 56.5mm.
Tylerrr Over 3 years ago
Would .040 be a good step up?
Right now I have the stock sized piston in my 1990 rm80 and my friend was riding it, a c-clip fell out and put a crack in the side of the piston, and tore the cylinder up pretty bad. I was wondering if I got it bored out, if this would be enough to fix the scars in the cylinder... Thanks in advance. The picture isn't that great
Expert MotoSport Staff
Over 3 years ago Location: Motosport
By the picture you included it is hard to say, since would have to see the cylinder in person and take the measurements. You would have to take to your locally shop, or machine shop to have them confirm the scoring marks in the cyliner.
Gilly Over 4 years ago
What is the original size piston on a1982 yamaha yz 490 j?
original bore
Expert MotoSport Staff
Over 4 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 4 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 4 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.
baileyboy Over 4 years ago
Will this give my pw80 anymore power top or bottum end?
Expert MotoSport Staff
Over 4 years ago Location: Portland, OR
this is a stock OEM type replacement piston.
sdiem Over 5 years ago
What all comes with piston?
Expert MotoSport Staff
Over 5 years ago
This included piston, piston rings, wrist pin, and both circlips.
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
Expert MotoSport Staff
Over 5 years ago
This will only include the piston, rings, pin and the clips only.
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