Wiseco 2-Stroke Piston

Wiseco 2-Stroke Piston
Wiseco 2-Stroke Piston

$35.77 - $171.99
15% Off - Save up to $30.00

Description See Also: 5 Reviews 17 Questions Fitment
Item #WCO000U

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5 Reviews
4.5 out of 5 stars
5 Star   5 4 Star   0 3 Star   1 2 Star   0 1 Star   0
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All Reviews
GooberSB Verified Purchaser
Central, VA, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Worked great in my 97 RT 180

I;ve never replaced a piston before but had the service manual on hand. The Wiseco piston was packaged in a nice felt bag and had a very clear instruction booklet. I used my service manual for specs and had to file a little off the ring ends to get the minimum ring end gap. I'd buy another Wiseco for sure!

Frank Verified Purchaser
Ephrata, PA, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
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.

Illinois, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
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!

bang Top 10 Contributor
I Live in Adams TN Race 25 times a year Vet AM
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
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.

oakland, ca

17 Questions
Answered:   16
Not Yet:   1
Location: Lucerne Valley, CA 92356, USA
Q: Oversized big bore pistons?
2 months 5 days ago
I bought an 81 Honda atc 250r and come to find out the top end needed a piston so I ordered a stock piston for it which was 70mm ,,it came to me and I go to replace it and a nother surprise its ben big bored out to a 75mm piston which would now make it to a 310 or 350 cc not a 250r... cant find for the life of me a 75mm piston for this air-cooled 81 Honda atc.. wisco dosent make them no more please help
Location: Quebec City, QC, Canada
Q: What is the compression height on a Suzuki Rm80 1983-1985 piston?
1 year 10 months ago
Can't find this information and I need to know if it is the same as the newer Rm80 which is 27mm.Thanks
Expert MotoSport Staff
1 year 10 months ago
A: 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)
Q: 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?
1 year 11 months ago
Top 1 Contributor
1 year 11 months ago
A: 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.
Location: Grove City, PA 16127, USA
Q: What is correct piston/ring size for a bore measuring 54.25mm?
2 years ago
1985 Honda CR125
Top 1 Contributor
2 years ago
A: Wiseco offers the following bore sizes for the 1985 CR125:


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.
Q: PW50 overbore question?
2 years ago
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
2 years ago
A: 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.
Location: New Port Richey, FL, USA
Q: Im in need of a STD piston with rings?
2 years ago
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
2 years ago
A: 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.
Q: Does this kit come with a needle bearing?
2 years 4 months ago
1979 rm125
Top 1 Contributor Top 50 Contributor
2 years 3 months ago
A: 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.
Q: 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?
2 years 7 months ago
MotoSport Staff Expert
2 years 7 months ago
A: 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!
Location: Wichita, KS, USA
Q: Do I need to have the cylinder machined.?
2 years 8 months ago
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
Expert MotoSport Staff
2 years 8 months ago Location: Portland, OR, USA
A: 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.
Location: ga
Q: Need to order rings 2003 rm 124 w/ 58mm bore?
Over 3 years ago
MotoSport Staff
Over 3 years ago Location: Portland, OR, USA
A: If you give us a call we can provide pricing and availability of the 58mm rings for your 2003 RM125.
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