Pro X 2-Stroke Piston

$50.99 - $150.99
$43.99 - $128.99
4.30 out of 5 stars
Fitment Expert:
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Pro X 2-Stroke Piston
Pro X 2-Stroke Piston
  • Description
  • Reviews (9)
  • Q&A (6)
  • Fitment

Important note: This piston is for a stock sized bore. Please measure your cylinder to check clearance before ordering.

ProX pistons are precision machined on the latest, state of the art CNC equipment. The same low-expansion, low-friction piston alloy is used as is used for all major Japanese and European engine manufacturers. ProX Piston Kits are a first class solution to replace the original piston in your machine.

Most ProX pistons come with a coating. The O.E.M. style tin-coated pistons assist the wear-in process as when you first started the bike. ProX has developed a new skirt coating that not only assists the wear-in process, but also helps reducing friction after the wear-in. The black coating is made from a delicate mix of materials and will increase performance.

  • Cast piston puts engine back to standard specs without boring or replacing cylinder.
  • Interchanges directly with O.E.M. part.
  • Piston kit comes complete with piston, rings, pin and end clips.
4.3 out of 5 stars (9)
4.3 out of 5 stars
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1-5 of 9
Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Oceanside, CA, USA
jrsduly
Motosport makes this way to Easy

I use PRO-X Pistons for the Quality and Durability . Motosport sells it in a package with gaskets and a rod bearing everything you need to get back on the track. Braaaap

Overall 5 out of 5 stars
Verified Purchaser
Location: Gilbert, WV, USA
Brendan
Best place for parts!

Motosport has always been my go to place for all the parts I need! They have the best prices and quick shipping, so I can get back to riding my ATV faster and safe money! I am a person who likes to trade and work on projects, and Motosport always has the parts I need.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Top 1000 Contributor Verified Purchaser
Location: Prairieville, LA, USA
Hammerhead
Pro X is the way to Go....

We always rely on ProX Top End Kits.... Excellent Pistons.....

Overall 4 out of 5 stars
Doug105
Good replacement

I have been told that Pro-X supplies the OEM's. If that is true, then their pistons should be as good as Honda's. Only issue was that I replaced a Pro-X that lost a piston skirt after less than 30 hours. I was told that 2003 CR250's eat piston's though, and that 25-30 hours may be expected.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Kauai
808rider
Pistons

I just got the pistons into my 125 and it fits great And it's not to hard to put in I did it my self and I'm only 14 so I think that this is a good product and it came to me on Kauai in 2 days.

1-5 of 9
Total Questions (6)
Questions with answers:
  6
Questions without answers:
0
1-6 of 6
Matt 2 months 15 days ago
Stock piston size and will this fit?
1997 RM125
Expert MotoSport Staff
2 months 3 days ago
MotoSportExpert
This Pro X 2-Stroke Piston will fit a stock bore 1997 Suzuki RM125. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct piston 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.
Ripper10 Over 5 months ago Location: Michigan
Will this fit my 2001 kx125?
MotoSport Staff Expert
Over 5 months ago
MotoSportExpert
Yes. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct kit 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.
lawo 1 year 4 months ago Location: Florida
Will this fit a 1997 kx 125?
Expert MotoSport Staff
1 year 4 months ago Location: Portland, OR, USA
MotoSportRyanT
Yes, The Pro-X Piston is made to fit your 1997 Kawasaki KX125. Just be sure to correctly select the Year/Make/Model of your bike before ordering so we can be sure to send you the correct Piston for your bike.
teamktm 1 year 5 months ago Location: Bronx, NY, USA
Would this be good for my 2003 ktm125sx?
1 year 5 months ago Location: Kingman, AZ, USA
Tdawg
Yes it will fit nice
MotoSport Staff Expert
1 year 4 months ago Location: Portland, OR, USA
MotoSportRyanT
Yes, this Pro-X Piston kit would work with your 2003 KTM 125SX.
jgrantcarolina 1 year 10 months ago Location: Iron Station, NC 28080, USA
Which Piston To Use on an A Cylinder?
I have a 2006 YZ 85 that needs a Top-End change. The Cylinder is marked with an (A). However all the after market piston don't have the letter designation. My question is does it matter or should I get it from Yamaha?
MotoSport Staff
1 year 10 months ago Location: Portland, OR, USA
MotoSportExpert
After a bike has been ran and is due for a piston change, the cylinder has worn enough that you can install any "stock bore" piston in it. The sizing difference between an A to B cylinder is only .0001"-.0002" when they are new. This is why aftermarket companies such as Wiseco only offer 1 size piston for all the Yamaha A,B,C,D cylinders.
Wyatt 1 year 10 months ago Location: North Carolina, USA
The picture shows only one ring even though the piston has two grooves for "rings". The description says it come with "rings". whats included?
MotoSport Staff
1 year 10 months ago Location: Portland, OR, USA
MotoSportExpert
This will vary based on what bike it is for. If you can give us a call with your model specific information, we can let you know if it is a 1 or 2 ring piston for your application.
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