Athena P40321054 Racing Connecting Rod Kit for 2019-2025 Yamaha YZ85 85cc 2-Stroke

Athena — High-Performance Precision, Japanese Engineering, and Superior Rotational Durability

The crankshaft is the heart of your Yamaha YZ85's engine, and the connecting rod is the critical link that translates explosive 2-stroke power into motion. The Athena P40321054 Connecting Rod Kit is a premium, Japanese-made replacement engineered to meet and exceed the demanding performance requirements of high-RPM 85cc racing. Whether you are performing a routine bottom-end rebuild or recovering from a bearing failure, this kit provides the structural integrity needed for championship-level reliability.

Athena connecting rods are manufactured using high-quality, lightweight alloys similar to OEM specifications to maintain proper crankshaft balance and reduce reciprocating mass. Each rod undergoes a specialized superficial high-frequency treatment, which significantly increases fatigue resistance and reduces the stresses caused by rapid rotational and alternating movements. This ensures that even under the "pro-level" stress of a screaming YZ85, your bottom end remains stable and efficient.

• Precision Made in Japan to ensure the highest manufacturing tolerances and material quality.
• Advanced high-frequency surface treatment reduces rotational stress and increases fatigue life.
• Lightweight design maintains factory crankshaft balance for smooth, high-RPM operation.
• Direct replacement for the 2019-2025 Yamaha YZ85 85cc 2-stroke engine.
• Complete rebuild kit includes the connecting rod, high-load needle bearings, and crankpin.

Moto-House MX Pro Tip:

A connecting rod replacement is a precision task that requires a hydraulic press and professional crankshaft truing stands. When rebuilding your YZ85 bottom end, always inspect your main bearings and crank seals for wear. We recommend having your crankshaft balanced and trued to within .001" to minimize engine vibration, which protects your cases and ensures the longest possible life for your new Athena rod kit.

Year	Make	Model Fitment
2019-2025	Yamaha	YZ85 / YZ85LW (Large Wheel)

FAQ Questions

Q) Is this kit better than the OEM Yamaha rod?
A) Athena rods are engineered to provide identical or superior performance to OEM, utilizing Japanese manufacturing and specialized heat treatments to handle the rigors of racing.

Q) Does this kit include the small-end (piston) bearing?
A) Yes, this kit is comprehensive and includes the connecting rod, crankpin, and the necessary needle bearings for both ends.

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