Vertex 2-Stroke Piston

$52.99 - $197.99
$39.74 - $148.49
4.80 5 24
4.80 out of 5 stars
Fitment Expert:
Dirt Bike Dirt Bike ATV Make Year Model
 
Vertex 2-Stroke Piston
Vertex 2-Stroke Piston
  • Description
  • Reviews (24)
  • Q&A (8)
  • Fitment

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

As the O.E. supplier of two-stroke pistons to KTM, Vertex pistons have an outstanding reputation for quality and performance. Each gravity-cast piston is created with only premium aluminum alloys utilizing an 12 - 21% silicon content.

The silicon content in Vertex pistons is crucial to the quality of the piston. Silicon is critical in decreasing thermal expansion which, when an engine reaches normal operating temperatures, can change the geometry of the piston. Controlling this expansion means that a Vertex piston can be run at tighter tolerances for more power, less noise and maintain a longer lifespan for the piston. Additionally, the silicon content decreases wear on the piston skirt which also aids in the longevity of the piston.

In addition to the silicon, each Vertex piston utilizes a unique Molybdenum Disulphide (MOS2) coating which aids in the break-in process and reduces overall wear.

  • With the purchase of a premium quality piston, every Vertex piston kit contains a complete set of nitride-coated or chrome-plated piston rings, a fully case-hardened wrist pin and circlips - all at a competitive price.
4.8 out of 5 stars (24)
4.8 out of 5 stars
5 star   25
4 star   2
3 star 0
2 star   1
1 star 0
See Terms and Conditions
1-10 of 24
Overall 4 out of 5 stars
Location: Greensboro, NC, USA
2wheeltimmy
This is a "B" piston for KTM125SX

Although this says stock bore (2007 KTM125SX) keep in mind this is a B piston Vertex part #23928B so if you just got you cylinder replated, this is the wrong size, you need an "A" . No problem returning it, great customer service on the return but bad customer service when asked if this was an "A" piston and was told yes. Delayed my rebuild.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Ocala, FL, USA
DM794
Great Piston

The quality is second to none, the power certainly noticeable...and on top of that the piston itself looks pretty cool too, excellent machine work. I would definitely recommend this piston to all my friends.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Tennille, GA, USA
klewis13
Great product

This is a great overall piston brought the power back for my ktm good tight fit

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Shawnee, OK, USA
CanAmMan1234
Great product!

It installs pretty straight forward and if you have basic skills in engine work you will have no trouble.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: victoria -Australia
toprankrmracer
Awsome after market product

i now have2 of these vertex pistons on my full moded rm85 race bike and hope to get another for my newly brought rm 125!
awesome light weight design,
good friction coating
single ring performance
good lubricating mod holes
very good price for the deal you get
cheers
glen
Australia

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Kingston, TN, USA
KTM09
New piston and ring put the snap back in!!

The new ring and piston put the snap back in the bike so much had to let the little guy get use to the bike again. I could have got away with just rings but for the price might as well do the job right and not have to worry about it. The piston fit just like the guys said it would. Thanks

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Top 500 Contributor Top 1000 Contributor Verified Purchaser
Motocrosser
Great piston!

Great piston and great price.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Location: Western PA
DirtWarrior
Looks cool, performs better!

This is a great piston. Just be sure to measure your cylinder BEFORE you buy a certain size to prevent fitment issues.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Cocoa Beach, FL, USA
cycleamick
Great Product

I noticed a huge power gain when I installed this piston the only issue I have with it is the C clips. They are very hard to install.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Texas
Lgdog
Awsome

I think that your products are awesome and y'all make every thing easy! I definitely will recommend Motosport to a friend or family member! Thanks Motosport....Robert

1-10 of 24
Total Questions (8)
Questions with answers:
  8
Questions without answers:
0
Drill holes?...
JasonGraaf
Chandler
Aaron Location: Manteca ca
1-8 of 8
shopdad 3 months 24 days ago Location: California, USA
Does this come with head and cylinder gaskets?
MotoSport Staff Expert
3 months 22 days ago
MotoSportExpert
No, this would be for the piston kit only (no gaskets). Gaskets can be found in our OEM section for your bike.
http://www.motosport.com/dirtbike/oem-parts/honda/2002/cr80

Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
JasonGraaf Over 7 months ago
Drill holes?
For Wiseco pistons, the included instructions specify that 2 small holes must be drilled in the piston skirt to lubricate the exhaust bridge (2004 cr125). The Vertex piston instructions do not specify that this should be done, but I am cautious of leaving the exhaust bridge unlubricated. Should I drill the holes or not?
MotoSport Staff Expert
Over 7 months ago
MotoSportExpert
No you should not need to drill holes in the Vertex Piston for your CR125.
Chandler Over 9 months ago
Same size as OEM?
I have a 1998 kx125, would this fit the stock cylinder head? Is it the same size as OEM?
Expert MotoSport Staff
Over 9 months ago
MotoSportExpert
Yes this would be stock bore for your 1998 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. Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Corey 2 years ago Location: Fort Collins
Stock Bore "B"?
My cylinder is stamped with a "B" on my 2011 YZ250. This is a stock bore, correct? The Vertex 2-Stroke Piston- Stock Bore is the correct size?
MotoSport Staff Expert
2 years ago Location: Portland, OR, USA
MotoSportRyanT
Yes, since this is a forged piston instead of a cast piston like your OEM piston was it does not have the "A, B, C" designation. It will work perfectly fine with the "B" cylinder on your YZ250 as forged pistons actual form to fit the shape/size of the cylinder when they are run through a heat cycle or break in period.
Aaron 2 years 1 month ago Location: Manteca ca
Does the kit come with all the gaskets needed?
Top 250 Contributor
2 years 1 month ago Location: upstate SC
RyanK
No gaskets included with this kit. You'll need a top end gasket kit as well.
Expert MotoSport Staff
2 years 1 month ago Location: Portland, OR, USA
MotoSportRyanT
This is actually just the Piston, Rings, Wrist Pin and Circlips. It would not include the Gaskets. We do offer several Piston Kits that would include the gaskets (see product recommendations).
2 years 1 month ago Location: Riverside, CA, USA
Bunker
No you need to get gasket kit as well
Top 250 Contributor
cr250chick 2 years 2 months ago
2003 CR250 Piston fitment?
I have an 03 CR250 and I just installed the Vertex piston (Stock Bore) that I bought here a few months ago. After only a few hours of riding I pulled the top and noticed it has been rubbing against the cylinder in the front where the exhaust ports are. I have an A cylinder and noticed the piston has a B on the top. When I ordered it there was only one option when it came to piston size but I'm guessing this is the wrong size for my cylinder. Is there an option for an A piston from vertex?
Top 1 Contributor
1 year 3 months ago
MotoSportExpert
Vertex only list one piston size for you 2003 CR250 bike: 66.35mm

Be sure to ALWAYS measure the cylinder bore before ordering a piston for your bike and refer to an OEM service manual for the proper specs required.
mikep 2 years 6 months ago
I need to find the type 2 size piston due to the larger cylinder where can i find it?
MotoSport Staff
2 years 5 months ago Location: Portland, OR, USA
MotoSportExpert
Not sure what you mean by "type 2" piston. If you can call us with what the current bore size is of the cylinder we can get the corresponding piston for you. Stock would be 54mm on this model.
dogman 2 years 10 months ago Location: walterboro sc
One side of my motor is good one side is bad can i use this piston for the bad side or do i need both?
MotoSport Staff
2 years 10 months ago Location: Portland, OR, USA
MotosportStaff
I suggest doing both top ends at the same time to start off fresh. Replacing one piston and not the other will cost you more time and money in the long run.
2 years 7 months ago Location: camden on gauley WV
kawasaki76
It would be better to do both sides so that it would be a fresh rebuild and it would save you time and money. You might replace one side and then a few days or something the other side will go bad.
1-8 of 8