Shopping CartCLOSE
  • Your cart is empty.
Vertex 4-Stroke Piston
Vertex 4-Stroke Piston

$ 109.76 - $ 239.36
10% Off - Save up to $26.59

Select your bike to see if this piston fits
Item #VER0004

Read More
12 Reviews
4.6 out of 5 stars
5 Star   9 4 Star   2 3 Star   0 2 Star   1 1 Star   0
Write a Review

Write your review and you'll automatically be entered in our monthly drawing. Include an image or video to DOUBLE your chances to win!

Write Your Review Write a review to win $500
All Reviews
Verified Purchaser
Bowman SC
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Great Price for value

When you price manufacture OEM prices. The price is great value.
Just set proper clearance and follow proper break in !

Verified Purchaser
Kennewick, Washington
Ease of Installation 1/5 Style 2/5
Very disappointing design and instructions

The first piston set came with only 1 oil scraper ring instead of the required 2. The 3 piece oil scraper ring setup is next to impossible to install correctly into the cylinder. The piston looks like a thing of beauty although it does not come with the cir-clip locating hole like the OEM piston does but did come with the "tangs" in the cir-clips that requires the holes to properly seat in the cir-clip groves. This 3 piece oil scraper ring set and cir-clip setup is a royal pain. The OEM KTM piston set may cost more but in my opinion a much better option in the long run. I've always had good luck with Vertex 2 stroke pistons but this replacement set for the 350 KTM 4 stroke has been very frustrating to get installed correctly (definitely not for the amateur home mechanic). Missing parts, incorrect parts - very frustrating.

Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Nice fit

I’ve had this is for about five practices and four race motos and love the power it makes

Verified Purchaser
Cerro Gordo, NC
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Works great!

As good if not better than stock. Very satisfied! This was my first time buying a vertex piston and it will not be my last

Verified Purchaser
Billings, MT
Durability 4/5 Ease of Installation 3/5 Performance 5/5 Power 5/5 Style 4/5
Power house!

I just rebuild my yz 450f and noticed a night and day difference in power, going from stock to the vertex high compression piston. Alot more snap out of corners and all around power

Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Came with all parts needed from start to finish

I read a lot of reviews on this kit before I bought it and I am very glad I decided to purchase it!! It totally restored the power and it made my bike like new again! I would definitely recommend this to anyone! The kit was used on a 2008 yz450f

Verified Purchaser
Durability 4/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 5/5
Noticeable power

Wanted to freshen up my sons kx250f during the off season. Vertex was recommended by my friend Tony @ REP Racing as an option to oem. Fairly straight forward install. Oil rings were a little tricky/delicate, not a big deal. When my son got on the track this season, he felt a considerable increase in power. Vertex puts out a very well machined, precision piston. Also KTM uses them as oem, so there’s that. I’ve had a good experience with their product, and will purchase from them again. Motosport awesome as usual.

Verified Purchaser
Charleston, SC, USA
Durability 5/5 Ease of Installation 3/5 Performance 5/5 Power 5/5 Style 5/5
Perfect Fit

I bought this for my RMZ 450. The fit is perfect and it works great.

Osawatomie, KS
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Awesome product

I bought about a month ago and it’s made my bike run better than ever

Verified Purchaser
Durability 5/5 Ease of Installation 4/5 Performance 5/5 Power 5/5 Style 5/5
Great piston

My favorite piston in the market. Hold up well and long

See 2 More Reviews
10 Questions
Answered:   9
Not Yet:   1
Q: Does this come with top end seals such as new cylinder seal
3 months 16 days ago
Top 10
3 months 16 days ago
A: I am guessing you are asking about gaskets and not seals. No. For this piston kit you would have to purchase a top end gasket kit separately.
Q: How do I order only the rings for this piston?
4 months ago
Top 10
4 months ago
A: That would require a special order. Please contact us at 1-888-676-8853 and we can help with this!
Q: Will a 14:1:1 piston work alright with a stage 2 hotcam? Bike is a 2014 crf250r.
Over 5 months ago
Top 10
Over 5 months ago
A: Yes, however with a high compression piston you must run race fuel.
Q: Will this high compression piston work in a 08 ltr 450 with cherry bomb full Yoshimura  exhaust and open air box?
Over 5 months ago
Top 10
Over 5 months ago
A: Yes, we have a piston for your fitment.
Q: Will this work good on a klx400r and will I get any hp gains with this piston and will it decrees the reliability with the 13.5:1 compression
1 year 11 months ago
Q: Need to know about upgrades
2 years 1 month ago
Ok so I recently purchased a bike and now the rings are going out... it has high compression piston and rings as well as a few upgrades such as hot rod crank stage 2 hot cam white kibble valves and a full yoshi exhaust. Was wondering if this would perform ok with the listed mods
Expert MotoSport Staff
2 years 1 month ago
A: Yes the Vertex 4-Stroke Piston would work great in your 2005 Honda CRF450R. Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Q: How do I know which compression ratio I have? I have a 2013 450 sxf non factory just stock with a full exhaust
2 years 1 month ago
MotoSport Staff Expert
2 years 1 month ago
A: Stock compression would be 12.6:1. Feel free to give us a call at 888-676-8853 and we would be happy to help you out with your order.
Q: What is the comp ration w this pistion std bore warrior 350?
Over 3 years ago
MotoSport Staff Expert
Over 3 years ago
A: The Vertex piston (23103) for your 350 Warrior would be 10.25:1 compression ratio.
Q: Is this kit a complete kit for Both cylinders or is it just a kit for only one and i would need to purchace 2 kits on a brute force 750
Over 3 years ago
Top 1 Contributor
Over 3 years ago
A: The Vertex Piston is sold per cylinder. You will need qty=2 for a Vforce or Brute Force Kawasaki.
Q: Whats the best aftermarket high compression piston for my KTM 350 SXF
Over 5 years ago
MotoSport Staff
Over 5 years ago
A: Any of the aftermarket pistons are going to be good. I would have no problem recommending any of the major manufacturers such as, Wiseco, JE, CP or Vertex. Each engine builder will have his own preference, but realistically they are all pretty similar. Personally i have always used Wiseco Pistons in my bikes.

See all bikes that this part fits...

See Fitments
# Part Numbers
Product Variant Manufacturer Part #
Stock Bore 23302B
Stock Bore 22983B
Stock Bore 23443B
Stock Bore 23510B
Stock Bore 23162
Stock Bore 22814B
Stock Bore 23003B
Stock Bore 23455B
Stock Bore 23163B
Stock Bore 23522B
Stock Bore 23638B
Stock Bore A Size 22982A
Stock Bore 23259B
Stock Bore 23566B
Stock Bore 22951B
Stock Bore 23242A
Stock Bore A Size 23445A
Stock Bore 23543A
Stock Bore A Size 23235A
Stock Bore A Size 23641A
Stock Bore 22941C
Stock Bore A Size 23342C
Stock Bore 22942B
Stock Bore 23311B
Stock Bore 23564B
Stock Bore 23198B
Stock Bore 23377B
Stock Bore 23532B
Stock Bore 22805B
Stock Bore 23127B
Stock Bore 23391B
Stock Bore 22567A
Stock Bore 22605A
Stock Bore 22915B
Stock Bore 23562B
Stock Bore 22984B
Stock Bore 23103
Stock Bore 23104
Stock Bore A Size 23623A
Stock Bore 13.3:1 Compression 23114B
Stock Bore 13.4:1 Compression 23113B
Stock Bore 13.4:1 Compression 23544A
Stock Bore 13.5:1 Compression 23444B
Stock Bore 13.5:1 Compression 23549B
Stock Bore 13.5:1 Compression 23550B
Stock Bore Single Ring 13.5:1 Compression 22812B
Stock Bore 13.5:1 Compression 22896B
Stock Bore 14.1:1 Compression 23561B
Stock Bore 12.9:1 Compression 23456B
Stock Bore 12.9:1 Compression 23378B
Stock Bore 13.1:1 Compression 23546B
Stock Bore A Size 13.2:1 Compression 23446A
Stock Bore 13.8:1 Compression 23565B
Stock Bore 13.9:1 Compression 23458B
Stock Bore 13.9:1 Compression 23567B
Stock Bore 13.9:1 Compression 23515B
Stock Bore 13.9:1 Compression 23394B
Stock Bore 12.6:1 Compression N/A
Stock Bore 13:1 Compression 23243A
Stock Bore 13:1 Compression 23199B
Stock Bore 13:1 Compression 23553B
Stock Bore 11:1 Compression 23555B
Stock Bore 14:1 Compression 23642A
Stock Bore 11:1 Compression 23329B
Stock Bore 11.9:1 Compression 23379B
Stock Bore 11.9:1 Compression 23381B
Stock Bore 12.5:1 Compression 23417B
Stock Bore 10.2:1 Compression 23643B
Stock Bore 13.2:1 Compression 23646B
Stock Bore 12.3:1 Compression 23711B
Stock Bore 13.9:1 Compression 23757B
Stock Bore 11.7:1 Compression 23759B
Stock Bore 11.8:1 Compression 23762B
Stock Bore 13.6:1 Compression 23831B
Stock Bore 10.6:1 Compression 23832B
Stock Bore 12.6:1 Compression 23849B
Stock Bore 12.5:1 Compression 23855B
Stock Bore 12.5:1 Compression 23857B
Stock Bore 11.8:1 Compression 23859B
Stock Bore 13.5:1 Compression 23861B
Stock Bore 12.5:1 Compression 23863B
Stock Bore 8.8:1 Compression 23908B
Stock Bore 13.5:1 Compression 23941B
Stock Bore 12.5:1 Compression 23958B
Stock Bore 13.5:1 Compression 23961B
Stock Bore 10.1:1 Compression 23965B
Stock Bore 10.5:1 Compression 24027B
+0.50mm 23103050
+1.00mm 23103100
+0.50mm 23104050
+1.00mm 23104100
+0.50mm 23162050
+1.00mm 23162100
Stock Bore 13.5:1 Compression 22889B
Stock Bore 12.5:1 Compression 22900B
Stock Bore 12.5:1 Compression 22969B
Stock Bore B Size 22982B
Stock Bore B Size 23235B
Stock Bore 13.3:1 Compression 23236B
Stock Bore 12.2:1 Compression 23304B
Stock Bore 12.0:1 Compression 23340B
Stock Bore B Size 23342B
Stock Bore 12.8:1 Compression 23380B
Stock Bore B Size 23445B
Stock Bore B Size 13.2:1 Compression 23446B
Stock Bore 13.7:1 Compression 23529B
Stock Bore 11.5:1 Compression 23545B
Stock Bore 11.0:1 Compression 23548B
Stock Bore 13.0:1 Compression 23551B
Stock Bore 13.5:1 Compression 23563B
Stock Bore B Size 23623B
Stock Bore 10.9:1 Compression 23639B
Stock Bore B Size 23641B
Stock Bore 14.0:1 Compression 23642B
Stock Bore 12.0:1 Compression 23644B
Stock Bore 14.6:1 Compression 23730B
Stock Bore 13.6:1 Compression 23731B
Stock Bore 14.5:1 Compression 23732B
Stock Bore 13.8:1 Compression 23733B
Stock Bore 14.5:1 Compression 23734B
Stock Bore 14.0:1 Compression 23736B
Stock Bore 13.8:1 Compression 23737B
Stock Bore 14.2:1 Compression 23738B
Stock Bore 13.6:1 Compression 23739B
Stock Bore 12.5:1 Compression 23833B
Stock Bore 13.2:1 Compression 23847B
Stock Bore 14.1:1 Compression 23848B
Stock Bore 13.2:1 Compression 23850B
Stock Bore 13.2:1 Compression 23856B
Stock Bore 13.6:1 Compression 23858B
Stock Bore 12.3:1 Compression 23860B
Stock Bore 13.9:1 Compression 23862B
Stock Bore 13.1:1 Compression 23864B
Stock Bore 13.6:1 Compression 23869B
Stock Bore 13.4:1 Compression 23870B
Stock Bore 13.5:1 Compression 23871B
Stock Bore 14.0:1 Compression 23872B
Stock Bore 13.8:1 Compression 23873B
Stock Bore 13.8:1 Compression 23874B
Stock Bore 11.5:1 Compression 23909B
Stock Bore 14.2:1 Compression 23942B
Stock Bore 14.4:1 Compression 23954B
Stock Bore 13.5:1 Compression 23959B
Stock Bore 13.7:1 Compression 23960B
Stock Bore 14.1:1 Compression 23962B
Stock Bore 14.6:1 Compression 23963B
Stock Bore 11.1:1 Compression 23966B
Stock Bore 24018B
Stock Bore 24020B
Stock Bore 24024B
Stock Bore 12.1:1 Compression 24025B
Stock Bore 11.5:1 Compression 24028B
Stock Bore Pro 13.9:1 Compression 24080B
Stock Bore Pro 13.8:1 Compression 24092B
Stock Bore 24097B
Stock Bore 24098B
Stock Bore 24099B
Stock Bore 24109B
Stock Bore 24119B
Stock Bore 24122B