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Athena

Athena 21-23 Gas Gas MC 250F 78mm Bore 250cc Standard Bore Gasket Kit

$69.95 $54.41 Save $15.54

SKU: A0EF P400270160078

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Special Order
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INSTALL DIFFICULTY
DIY PRO SHOP

Advanced — 4+ hours

Description

Part #: P400270160078

The Standard Bore cylinder kit developed by Athena guarantees the same performance as the original spare parts, extreme reliability and optimal smoothness as a result of the lightweight aluminum cylinder, the barrel with nickel-silicon coating, and a piston designed to reduce further friction. The kit includes the high-quality aluminum cylinder with standard bore, the complete piston with the piston pin and rings, and all the necessary gaskets.

MIA's Description

The Athena gasket kit is a top end gasket set for Athena Standard Bore Cylinder Kits. Athena has over 40 years of experience and offers a wide range of replacement engine gaskets. Each gasket is engineered in Italy, produced with strict parameters, and cut using the latest generation lasers for perfect quality. Surface treatments are performed to compensate for irregularities and material stress relieving processes improve sealing. This set includes all necessary gaskets for the cylinder kit. Athena gaskets offer low moisture absorption, high mechanical resistance, and resistance to oils, gasoline, high temperatures, and pressures.

Fitment

Fitment Guaranteed

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

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Specifications

BrandAthena
Part NumberA0EF P400270160078

Videos

Athena 4-Stroke Cylinder Kit Review by MotoEverything

Athena 4-Stroke Cylinder Kit Review by MotoEverything
Part 1: Installing Athena 290 Big Bore Kit- Yamaha WR/ YZ 250

Part 1: Installing Athena 290 Big Bore Kit- Yamaha WR/ YZ 250
Unleash EXTREME power: Athena’s Big Bore Kit for Kawasaki KX 250

Unleash EXTREME power: Athena’s Big Bore Kit for Kawasaki KX 250
Top End Piston Kit: all you need in one kit! 🔥

Top End Piston Kit: all you need in one kit! 🔥
Athena Racing Head Gaskets

Athena Racing Head Gaskets
Part 4: Installing Athena 290 Big Bore Kit- Yamaha WR/ YZ 250

Part 4: Installing Athena 290 Big Bore Kit- Yamaha WR/ YZ 250

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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