Wiseco 2-Stroke Piston

$87.99 - $201.99
$74.99 - $171.99
4.50 out of 5 stars
Fitment Expert:
Dirt Bike Dirt Bike ATV Make Year Model
 
Wiseco 2-Stroke Piston
Wiseco 2-Stroke Piston
  • Description
  • Reviews (4)
  • Q&A (16)
  • Fitment

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.

4.5 out of 5 stars (4)
4.5 out of 5 stars
5 star   3
4 star 0
3 star   1
2 star 0
1 star 0
See Terms and Conditions
1-4 of 4
Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Ephrata, PA, USA
Frank
It's a Wiseco, Nuff said.

Saw the Wiseco reps at the Hi Point National. Could'nt thank them enough for helping to keep my 1978 RM125 running strong.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Illinois, USA
cbr60002
PW50 Top End

Replaced Top end on a PW50. Cylinder, Cylinder head, pistion, rings, circlips, gaskets, & new nuts.All parts came in within 5 days. Everything matched up perfectly. I have done plenty of business with Motosport over the years. They have good prices & parts & service are excellent!

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Top 25 Contributor Top 50 Contributor Top 10 Contributor
Location: I Live in Adams TN Race 25 times a year Vet AM
bang
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.

Overall 3 out of 5 stars
Location: oakland, ca
tone

1-4 of 4
Total Questions (16)
Questions with answers:
  16
Questions without answers:
0
Yann Location: Quebec City, QC, Canada
1-10 of 16
Yann Over 5 months ago Location: Quebec City, QC, Canada
What is the compression height on a Suzuki Rm80 1983-1985 piston?
Can't find this information and I need to know if it is the same as the newer Rm80 which is 27mm.Thanks
MotoSport Staff Expert
Over 5 months ago
MotoSportExpert
Wiseco does not provide that information. I would try contacting them directly at Toll Free: 1-800-321-1364 or 1-888-494-7326 (Canada)
Gbarbee Over 6 months ago
My bike is bored over all the way. And I took the cylinder to the local parts store and they said I needed a 52mm piston. So would this piston fit?
Top 1 Contributor
Over 6 months ago
MotoSportExpert
Yes! The largest piston that Wiseco makes for your 2006 Honda CR85 is a 52.00mm sizing. Be sure to select the correct size in the pulldown menu. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Prezz8 Over 7 months ago Location: Grove City, PA 16127, USA
What is correct piston/ring size for a bore measuring 54.25mm?
1985 Honda CR125
Top 1 Contributor
Over 7 months ago
MotoSportExpert
Wiseco offers the following bore sizes for the 1985 CR125: 54.00mm 54.50mm 55.00mm 55.50mm 56.00mm Consult your service manual to determine the correct size piston with the clearances required. If you need more help, consult a local service or machine shop to help you.
rdubtx Over 7 months ago
PW50 overbore question?
I have a 2004 Yam PW50 with original cyclinder which has scoring. Shop says should be able to overbore back into round. Mic'd it at 39.80-39.50. Which oversize piston should I order before having bored so I can take to the machinist to ensure he bores for correct clearance?
Top 1 Contributor
Over 7 months ago
MotoSportExpert
Wiseco list the following sizes of pistons for the PW50s: 40.00 mm 40.25 mm 40.50 mm 40.75 mm 41.00 mm 41.50 mm 42.00 mm You will need to consult the machine shop to tell you which size of piston will fix the issues with your cylinder.
Rj1Nash Over 8 months ago Location: New Port Richey, FL, USA
Im in need of a STD piston with rings?
i have a 1995 yamaha rt180. i have a .050 piston with no rings.i need the standard piston head with rings.
Top 1 Contributor
Over 7 months ago
MotoSportExpert
Wiseco does NOT make a piston for the RT180. I would suggest to check if the OEM Yamaha parts are still available for your bike. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Heff Over 11 months ago
Does this kit come with a needle bearing?
1979 rm125
Top 50 Contributor Top 1 Contributor
Over 10 months ago
MotoSportExpert
The Wiseco 2 Stroke Piston kit does not come with a wrist pin bearing. You can order that separately or or the top end kit which includes the piston kit, top end gasket kit and wrist pin bearing. We may not have fitment for you 1979 RM125 model bike.
Dugnut 1 year 3 months ago
I'm needing to replace piston on a 84 rm 125 and the bore on the cylinder I measured at 55.016mm what do I need for piston and rings?
MotoSport Staff Expert
1 year 2 months ago
MotoSportExpert
55MM is a 1.0 over stock bore size (specific to your model). Judging by your measurement you'll want to contact us to check availability for your year and model bike. Feel free to give us a call so we can help you out!
Justinsanger 1 year 3 months ago Location: Wichita, KS, USA
Do I need to have the cylinder machined.?
I have a 97 rt180 with low compression. I have never done a rebuild and wasn't sure if I needed to have the cylinder bored or how to tell. Also what is the stock bore. Any answers help. Thank you
MotoSport Staff Expert
1 year 3 months ago Location: Portland, OR, USA
MotoSportRyanT
It is hard to say without seeing the inside of the cylinder whether or not it will need to be bored out. It is possible that just replacing the piston/rings would fix the lack of compression but I would recommend taking the bike to a motorcycle shop with a service department to have it looked at.
jeff 1 year 8 months ago Location: ga
Need to order rings 2003 rm 124 w/ 58mm bore?
MotoSport Staff
1 year 8 months ago Location: Portland, OR, USA
MotoSportExpert
If you give us a call we can provide pricing and availability of the 58mm rings for your 2003 RM125.
Nick 2 years 1 month 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
2 years 1 month ago Location: Portland, OR, USA
MotoSportExpert
The correct rings for your .020" over piston would be 56.5mm.
1-10 of 16