Athena

Athena 01-04 Yamaha YZ 125 Stock Bore Complete Cylinder Kit - P400485100008

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SKU:
ATHP400485100008
UPC:
8055681300880
MPN:
P400485100008
Availability:
Regularly stocked product
MSRP: $898.95
$830.19
— You save $68.76
Current Stock: 1

Sold Out

Frequently bought together:

Description

Is this a complete bolt-on kit?
ATH Std Bore Cylinder Kits include essential components, but professional installation for your 2001-2004 Yamaha YZ125 ensures optimal performance and fitment.

What is the recommended installation process for this cylinder kit?
Professional installation is recommended for these Athena Cylinder Kits to guarantee precise fitment and unlock superior engine performance benefits.

Athena Std Bore Cylinder Kits are engineered for the 2001-2004 Yamaha YZ125, delivering a 9/10 score for Engine Performance. Featuring an aluminum cylinder with galvanic coating and a forged piston with molybdenum coating, these Cylinder Kits provide exceptional heat dissipation and friction reduction for peak power.

What Owners Say

Owners and enthusiasts consistently praise Athena cylinder kits for their superior cylinder coatings and enhanced cooling capabilities, with many noting the price premium is justified by the quality. The big bore kits particularly stand out as "game-changers," especially now that Athena provides ECU maps for stock systems. Users appreciate that these kits deliver reliable performance upgrades without the risk of catastrophic failures associated with cheaper alternatives—a critical factor since blown components can send shrapnel into the crankcase. While some installation challenges like mounting issues can arise, enthusiasts agree Athena's engineering and build quality make them the preferred choice over budget options for serious dirt bike modifications.

Key Features

  • aluminum cylinder with galvanic coating design
  • forged piston with molybdenum coating

Why Choose the ATH Std Bore Cylinder Kits

Delivers superior heat dissipation for sustained peak engine performance.

Achieves enhanced durability and reduced friction for a smoother ride.

Provides increased power output and responsiveness for aggressive riding.

Transforms your Yamaha YZ125 with race-proven engine reliability.

Who Is This For?

Engine Performance — 9/10
Aluminum cylinder, forged piston enhance power output.

Racing Competition — 8/10
Premium performance, enhanced durability for racing.

Track / Autocross — 8/10
Premium performance, enhanced durability for track use.

Street Performance — 7/10
Smoother, more powerful ride claims.

Weekend Off-Roading — 7/10
Enhanced durability for off-road conditions.

Additional Resources

Official Athena Product Page

Important Notices

⚠️ CARB Notice: This product is NOT legal for street use in California under CARB (California Air Resources Board) regulations. For off-road or race use only.

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Additional Information

CARB:
This product is not CARB Legal and not for sale in California
Clearance Item:
N
MPN:
P400485100008
Proposition 65:
N
Case Lot Quantity:
1
Category:
Engine Components>Cylinder Kits
Product Level:
Premium Performance
Engine Performance:
9/10
Racing Competition:
8/10
Track / Autocross:
8/10
Street Performance:
7/10
Weekend Off-Roading:
7/10
View AllClose

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