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Athena

Athena 22-24 Yamaha YZ 125cc / 23-24 Yamaha YZ X 125cc Standard Bore Cylinder Kit

$881.95 $700.97 Save $180.98

SKU: A0EF P400485100100

Out of Stock
In Stock
Ships by Jun 20
Free Shipping
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Replacement standard bore cylinder kit for the Yamaha YZ 125, designed and produced by Athena. Features a high-quality aluminum alloy cylinder for strength, durability, and effective cooling. The meticulously designed piston maximizes engine efficiency with advanced profile and lightweight construction for quick acceleration. Includes a complete gasket kit for installation.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandAthena
Part NumberA0EF P400485100100

Videos

Athena YZ144 Kit - Big Bore Case Mods and Top End Install. Project YZ144 part 6

Athena YZ144 Kit - Big Bore Case Mods and Top End Install. Project YZ144 part 6
What Is An Athena Big Bore Kit | YZ125 Build | What Comes In The Box

What Is An Athena Big Bore Kit | YZ125 Build | What Comes In The Box
Athena Big Bore 2005 YZ125

Athena Big Bore 2005 YZ125
YAMAHA YZ 125 | ATHENA CYLINDER ASSEMBLY | RAW VIDEO

YAMAHA YZ 125 | ATHENA CYLINDER ASSEMBLY | RAW VIDEO
Free Yamaha YZ125 Gets an Engine Makeover (It needed it)

Free Yamaha YZ125 Gets an Engine Makeover (It needed it)
How Much Power Can We Get From a 2023 YZ125? | Stock vs Tuned Shootout!

How Much Power Can We Get From a 2023 YZ125? | Stock vs Tuned Shootout!

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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