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Vertex 4-Stroke Piston Kit - Stock Bore

$166.98 - $317.98
$130.99 - $252.99
4.70 5 6
4.70 out of 5 stars

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Vertex 4-Stroke Piston Kit - Stock Bore
Vertex 4-Stroke Piston Kit - Stock Bore
  • Description
  • Reviews (6)
  • Q&A (8)
  • Fitment

The MotoSport.com Vertex 4-Stroke Piston Kit - Stock Bore includes one of each of the following components with the following attributes:

Vertex 4-Stroke Piston Kit:

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

When it comes to power and performance, Vertex four-stroke pistons are hard to beat. Forged from the highest quality 2618 aluminum alloy, Vertex pistons are perfectly suited to handle the rigors and high pressures of today's modern four-stroke engines. Plus, to aid in the break-in process and reduce wear, every Vertex piston utilizes a unique Molybdenum Disulphide (MOS2) coating on the piston skirt.

Vertex Piston includes:

  • Premium quality Vertex piston.
  • Complete set of nitride coated or chrome-plated piston rings.
  • Fully case-hardened wrist pin.
  • Circlips.
  • Competitive price!

Cometic Top End Gasket Kit:

State-of-the-art gaskets is what Cometic has been doing since its inception in 1989. This comes from their dedication to constructing gaskets for the most demanding race circuits like AMA and NASCAR. Today's lightweight engines are producing more horsepower, higher cylinder pressure, clamp load and extreme temperatures. Cometic's commitment is to provide innovative, quality gaskets while maximizing your engine's power and performance.

Cometic meets the needs of each specific gasket by using materials to match. Even the basic top end gasket kit features different materials for each gasket. The head gasket is constructed from non-asbestos, flexible graphite that is laminated to a stainless steel core. The manifold and base gaskets are constructed from non-asbestos nitride rubber-bound fiber. Cometic also includes copper gaskets where needed.

Cometic designs and builds their gaskets in the U.S.A.

Note: Image is for reference only, actual Kit may vary based on contents and fitment.

4.7 out of 5 stars (6)
4.7 out of 5 stars
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3 star   1
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1-6 of 6
Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
bzsskibum
Good so far

so far so good, could feel the power difference. I ride a 2006 ktm 250 sxf. the only problem I had was with the cam chain tightener. if you are reinstalling one of them make sure you follow instructions on line.. you can do some real damage to your bike if its in wrong. there is a set of steps to follow to preload the spring before instillation. Good luck

crow hill J-day
Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Tifton, GA, USA
Chad
Vertex piston

This piston kit restored the power and compression and was a breeze to install

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Greelz
Really nice.

This vertex piston made it easy. I got the kit and everything was there a, tolerances we right on, and it was clean. I would use this anytime.
I ride a crf 450r.

Overall 5 out of 5 stars
Durability
Ease of Installation
Performance
Power
Style
Verified Purchaser
Location: Camden OH
Randog
Very pleased

One season with this top end and so far so good. Still hits hard!

Overall 5 out of 5 stars
Location: Redding, CA
Trackster1
Don't Make A Mistake

I have talked to many people who have paid big bucks for a tricked out piston, only to find it unbalanced the motor, or alters the power too radically. These pistons have developed a good reputation as reliable pistons, close to OEM specs.

Overall 5 out of 5 stars
Top 50 Contributor
Location: Bismarck, ND
TFerguson08
Impressed!

got this piston for my crf250 and planned on it only lasting me a few hours 40 hours later on it still running strong and showing no sign of wear. plus it was super easy to install and anyone with some mechanical knowledge can do it. Highly recommend vertex!

1-6 of 6
Total Questions (8)
Questions with answers:
  8
Questions without answers:
0
2012 yz250f?...
Myles
1-8 of 8
Jesse 1 month 25 days ago Location: Poquoson, VA, USA
2012 Honda CRF250R Compression question?
While I was on Vertex's website looking at all the different piston options, they only sell 13.2:1, 14.1:1 & 14.6:1 compression ratio pistons for the stock bore size. My question is your website says its 13.6:1 for the high compression piston when Vertex don't even make one currently. So is it a typo error?
MotoSport Staff Expert
1 month 25 days ago
MotoSportExpert
Yes for your 2012 Honda CRF250R the High Compression Piston Kit (23561B) would be 14.1:1 compression ratio.
Klemen Over 8 months ago
Gasket kit includes?
Expert MotoSport Staff
Over 8 months ago
MotoSportExpert
The Cometic Top End Kit (C3175-EST) for your Suzuki RMZ250 includes:

1 - Head Gasket
1 - Base Gasket
1 - Exhaust Gasket
1 - Cam Chain Tensioner O-Ring
1 - Cam Chain Tensioner Bolt Washer
4 - Valve Stem Seals
Momo319 Over 9 months ago Location: MO
Bore size?
So it says to measure the clearance of my cylinder before ordering to get the right size.. Do they sell a kit with different size Pistons if mine is out of clearance or do I have to bore or replate my cylinder to replace the top end?
MotoSport Staff Expert
Over 8 months ago
MotoSportExpert
Yes there are different size pistons we can order to fit your bike. If the part is available through one of our suppliers, we would be happy to order it for you. Please contact one of our sales professionals to inquire about special orders and availability.
Dirt Bike / ATV: 1-888-676-8853
Jbrunet47 Over 9 months ago Location: CA
Would i have to run race gas with a high comp piston on a 2008 rmz250 or could I get away with 91?
And is reliability an issue with this high comp piston or is it a thing where if u keep up on it you'll be ok?
Expert MotoSport Staff
Over 8 months ago
MotoSportExpert
Race gas is recommended.
Tyler Over 9 months ago
Stock compression of my bike is 13.8.1, this piston only goes to 13.2.1, do they make the right one for my bike?
MotoSport Staff Expert
Over 9 months ago
MotoSportExpert
Both Vertex and Wiseco do not offer a 13.8:1 ration piston kits. If you would like to set it up to stock specs you can find the stock OEM parts in the OEM section here:
http://www.motosport.com/dirtbike/oem-parts/kawasaki/2013/kx250f/cylinder~piston%28s%29

Also, feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Myles 1 year 4 months ago
2012 yz250f?
What comes with the gaskit kit?
Expert MotoSport Staff
1 year 4 months ago
MotoSportExpert
The Cometic top end gasket kit for the Yamaha YZ250F 01-13 includes:

1 - Head Gasket
1 - Base Gasket
1 - Exhaust Gasket
1 - Cam Chain Tensioner Gasket
2 - Exhaust Valve Stem Seal
3 - Intake Valve Stem Seal
1 - Inner Clutch O-Ring
1 - Head Drain Washer
6 - Oil Line Washer
pulgapei 2 years 7 months ago Location: Cabo San Lucas, Baja California Sur, Mexico
I need a piston that will last like an OEM piston , will this kit with the cilinder works be reliable?
MotoSport Staff
2 years 7 months ago Location: Portland, OR, USA
MotoSportExpert
The Vertex Pistons are very high quality and should be just as reliable as stock pistons with proper maintenance such as regular oil changes. The Cylinder works cylinder are pretty good but typically I prefer the OEM cylinders as the Nikasil coating seems to last longer. Depending on the current state of your stock cylinder, it can be re-plated by a company such as Millennium Technologies. If you send your piston in with the cylinder, they match the thickness of the coating to the piston for a perfect cylinder to piston fit.

http://www.mt-llc.com/
yamaharider171 2 years 11 months ago
Compression ratio???
MotoSport Staff
2 years 11 months ago Location: Portland, OR, USA
MotosportStaff
The compression ratio will depend on what model bike you have. This Vertex kit will have the same compression ratio as your stock piston.
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