Athena Top End Gasket Kit P400270600077 — Gas Gas / Husqvarna / KTM 125cc-150cc 2016-2023

Product Description

When you are performing a top-end rebuild on your 2-stroke engine, nothing is more critical than a perfect seal. The Athena Top End Gasket Kit is engineered to meet or exceed OEM specifications, providing the reliability and performance required for high-intensity off-road riding. This comprehensive kit includes all the high-quality gaskets, rubber components, and valve stem seals necessary to restore your engine to peak efficiency.

Athena’s gaskets are designed for durability, featuring head gaskets constructed from rubber-coated spring steel and soft steel base gaskets. The advanced steel core material offers superior tensile strength and high spring-back, while a revolutionary transparent coating guarantees a perfect seal even under extreme thermal stress. With high-temperature blue silicone beading on critical surfaces, you can trust this kit to handle the rigors of the track or trail.

Top Features: Athena Top End Gasket Kit

• Complete kit includes all necessary top-quality gaskets and rubber parts for a top-end rebuild
• Head gasket utilizes rubber-coated spring steel construction for maximum durability
• Soft steel base gaskets are precision rubber coated for a leak-free fit
• Steel core material provides superior tensile strength and high spring-back characteristics
• Revolutionary transparent coating ensures a reliable seal at extremely high temperatures
• Includes high-temperature blue silicone beading on most critical flat gaskets

Please review the detailed compatibility data below to ensure an exact fitment match for your motorcycle before finalizing your purchase.

Fitment List

Frequently Asked Questions

Q: Should I use a liquid gasket sealer with these?
A: Athena gaskets are designed to seal perfectly on their own thanks to the silicone beading and specialized coatings. Using extra liquid sealer can sometimes cause high spots or leaks, so it is best to install them clean and dry unless specifically noted in your service manual.

Q: Does this kit include everything I need for a top-end refresh?
A: Yes, this top-end gasket kit contains all necessary head, base, and exhaust port gaskets, as well as critical O-rings and seals to ensure a leak-free rebuild.

Expert Pro-Tip: Before installing your new base gasket, ensure the cylinder deck and engine case mating surfaces are surgically clean. Use a plastic scraper to remove old gasket residue—never use a metal blade, as it can score the aluminum and create a permanent leak path. Always check your squish clearance after installing new base gaskets, especially if you have changed compression ratios.

Recommended Pairings:
o KTM 125/150 SX Performance Parts
o Husqvarna TC 125 Performance Parts
o Gas Gas MC 125 Performance Parts

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