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03-24 Yamaha YZ250 YZ 250 72mm 300cc Athena Big Bore Cylinder Top End Piston Kit

AZ Quad Parts
(34628)
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US $1,348.16
or Best Offer
as low as $83.47/mo with
Condition:
New
Compatibility:
Last one9 sold
Popular item. 9 have already sold.
People want this. 59 people are watching this.
Shipping:
Free 2-4 day delivery
Get it between Thu, Dec 4 and Sat, Dec 6 to 94104.
Located in: Gilbert, Arizona, United States
Returns:
30 days returns. Seller pays for return shipping.
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eBay item number:195229537378
Last updated on Nov 19, 2025 14:33:19 PSTView all revisionsView all revisions

Compatibility

This part is compatible with 29 vehicle(s)
YearMakeModelSubmodelNotes
2024YamahaYZ250--
2024YamahaYZ25050th Anniversary Edition
2023YamahaYZ250--
2023YamahaYZ250Monster Energy Yamaha Racing Edition
2022YamahaYZ250--
2022YamahaYZ250Monster Energy Yamaha Racing Edition
2021YamahaYZ250--
2020YamahaYZ250--
2019YamahaYZ250--
2018YamahaYZ250--
2017YamahaYZ250--
2016YamahaYZ250--
2015YamahaYZ250--
2014YamahaYZ250--
2014YamahaYZ250Team Yamaha
2013YamahaYZ250--
2013YamahaYZ250Team Yamaha
2012YamahaYZ250--
2012YamahaYZ250Team Yamaha
2011YamahaYZ250--
Portions of the information contained in this table have been provided by azquadparts

Item specifics

Condition
New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ...
Non-Domestic Product
No
Machine Type
Off-road Motorcycle
Items Included
Cylinder Barrel, Gasket Set, Piston Rings, Pistons, Wrist Pins, Cylinder Head, Power Valves
Custom Bundle
No
Manufacturer Part Number
P400485100042
Superseded Part Number
5UP-11311-21-00, 5UP-11111-00-00, 1P8-11631-00-A0
Vintage Part
No
Modified Item
No
Placement on Vehicle
upper
California Prop 65 Warning
yes
Brand
Athena
Engine Type
2-Stroke
Type
Engine Rebuild Kit
Interchange Part Number
5UP-11311-21-00, 5UP-11111-00-00, 1P8-11631-00-A0
Manufacturer Warranty
1 Year
OE/OEM Part Number
5UP-11311-21-00, 5UP-11111-00-00, 1P8-11631-00-A0
Surface Finish
Silver
Features
Corrosion-Resistant, Durable
Country/Region of Manufacture
Italy
Performance Part
Yes
UPC
Does not apply
Category

Item description from the seller

About this seller

AZ Quad Parts

100% positive feedback•206K items sold

Joined Mar 2004
Usually responds within 24 hours
Visit storeContact

Detailed seller ratings

Average for the last 12 months
Accurate description
5.0
Reasonable shipping cost
5.0
Shipping speed
5.0
Communication
5.0

Popular categories from this store

See allcategories
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Seller feedback (35,543)

All ratingsselected
Positive
Neutral
Negative
  • 6***l (5)- Feedback left by buyer.
    Past month
    Verified purchase
    Excellent seller! The big bore kit is top quality and made a huge difference in the bike’s power. The performance gain was immediately noticeable — stronger torque, faster response, and overall much better riding experience. Shipping was fast and everything was well-packed and exactly as described. Very reliable seller and I definitely recommend buying from him!
    Suzuki LTZ400 LTZ 400 Z400 94mm 434 cc Big Bore Cylinder CP Top End Rebuild Kit (#201962893982)
  • e***w (100)- Feedback left by buyer.
    Past month
    Verified purchase
    AZ quad parts are great people to buy from.... Their parts are competitively priced or more so on the bargain side thier shipping times are very Swift and the items have always been as described in their ads this is why I have used them multiple times in the past few years....Thank you AZ quad parts for being a good reliable source for parts
    08-14 Polaris RZR 800 RZR800 Kibblewhite Replacement Intake Exhaust Valves Seals (#204626882072)
  • 6***1 (11)- Feedback left by buyer.
    Past year
    Verified purchase
    I was sent the wrong wrist pin bearing and this seller had no issue helping me over the phone figure out if it was an issue on my end or his. Ended up being a packaging error and he apologized and instantly issued a refund! Even though I was sent the wrong part I will be doing more business with AZ Quad parts because of how fast and easy they are! Seriously good guys over there.
    CP Carrillo 87-92 Suzuki LT250 LT 250 250R Heavy Duty Piston Wrist Pin Bearing (#202681903193)
See all feedback

Product ratings and reviews

Learn more
5.0
4 product ratings
  • 4 users rated this 5 out of 5 stars
  • 0 users rated this 4 out of 5 stars
  • 0 users rated this 3 out of 5 stars
  • 0 users rated this 2 out of 5 stars
  • 0 users rated this 1 out of 5 stars

Would recommend

Good value

Good quality

Most relevant reviews

See all 3 reviews
  • by 1of6corinne
    Feb 24, 2021

    One of the best kits on the market

    If you are thinking of getting a BB kit for your YZ250 look no further unless you go with Eric Gore products. I’ve been building hi performance YZ’s for many years and this is the cats meow. Unlike other BB kits (ESR) this kit uses the original technology of Nickel Plating (not a steel sleeve) and the OEM power valve system that Yamaha dominates the market in. The PV system has been used over 22 years and is flawless. Not only that, but you can pick up rebuild (piston kits) in any location and that means less down time when its time to rebuild. YZDOC Restorations approved and you will be happy as well.

    Verified purchase: YesCondition: NewSold by: atvunlimited

  • by mitzumark
    Dec 22, 2020

    Big bore kit

    It is all going together great. Cant wait to ride ot again.

    Verified purchase: YesCondition: NewSold by: apex*racing

  • by cafi.us.hfbtld
    Jan 18, 2021

    Major ccs

    More horsepower(cc)

    Verified purchase: YesCondition: NewSold by: rb_dev

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