CheckM8 Vented Transmission Top Cover

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Introducing the Trask CheckM8 Vented Transmission Top Cover – the ultimate solution to the common challenges faced by Harley-Davidson M8 engines. Revolutionize your riding experience with this innovative upgrade designed to address excessive oil consumption and blow-by issues.

Our patent-pending design features a one-way Boyesen valve, strategically engineered to bleed off excess crankcase pressure. This breakthrough technology ensures optimal efficiency by retaining oil/air mist in the cam chest while allowing the oil pump to function more effectively. Experience a significant reduction in oil exiting from the head breathers, leading to enhanced engine power and smoother revving.

Crafted with precision from lightweight and durable Billet Aluminum, the Trask CheckM8 Vented Transmission Top Cover not only provides unparalleled performance but also boasts a clean and stylish aesthetic. The straightforward installation process involves replacing the stock cover, offering a hassle-free upgrade that transforms the look and functionality of your M8 engine.

Proven on Trask Performance Race Bikes, this top cover is a testament to its reliability and effectiveness in high-performance scenarios. Elevate your ride with a product proudly made in the U.S.A., and redefine your Harley-Davidson M8 engine experience with the Trask CheckM8 Vented Transmission Top Cover – where innovation meets performance.

    Fitment Details

    Note: The CheckM8 cannot fix the M8 oil transfer problem. Harley-Davidson has a pump seal service bulletin that addresses this problem. (SEE CheckM8 BULLETIN)

    Due to our chrome coating requirement standard, additional production time is required and we are shipping on a first come first served basis.



    A portion of the proceeds from of every Check M8 purchase will be donated to Bikers Against Bullies.
    Your contribution will help create a safer and more inclusive environment for every child.

    Bikers Against Bullies (BAB) is a grassroots movement fighting bullying with passion and unity. Through outreach, education, and community events, BAB empowers individuals to speak up and support each other. With their unwavering dedication, BAB inspires positive change, making our communities safer and more compassionate for all.


    Please see instructions here


    Color: Chrome

    Be sure to select your variant(s) before adding to cart (if possible).

    With pride, Trask produces motorcycle performance products in the USA.