Honda CBX400F / CBR400F Oil Pan Gasket - 11398-MJ6-000

This is a genuine Honda Oil Pan Gasket (Part Number: 11398-MJ6-000). It is the critical sealing component for the oil pan (sump) of the 400cc inline-four engine family that defined Honda’s mid-range performance motorcycles in the early 1980s. Vehicle Compatibility & Year Fitment Model Compatible Years Honda CBX400F 1981–1984 Honda CBR400F 1983–1985 Technical Note: The MJ6 prefix corresponds to this specific 400cc inline-four engine architecture. This part is essential for maintaining a leak-free crankcase and preventing oil loss from the sump. 4. Fitment & Installation Details The application for this part is the oil pan located at the very bottom of the engine crankcase. Mechanically, this gasket sits between the bottom of the crankcase and the oil pan, creating a seal that must withstand the constant oil pressure and thermal cycling of the engine. When installing, it is vital to clean the mating surfaces thoroughly, removing all remnants of the old, hardened gasket material to ensure the new one seats perfectly. Because these older engines are prone to oil misting, ensure that all mounting bolts are tightened in a proper, uniform pattern to avoid warping the oil pan flange. Do not use high-strength liquid adhesives, as they can make future removal difficult and may interfere with the gasket’s ability to compress evenly. If the pan has been damaged by road debris, check for flatness against a straight edge before installing the new gasket to ensure a long-lasting, drip-free seal. Important: Please ensure the part number matches your motorbike before purchasing. If you have any questions about the part or its compatibility, feel free to contact us. We’re here to help! At Dmmotorcycles, we’ve specialized in vintage and vintage sports motorcycles and parts directly from Japan since 1998. We stock a wide selection of rare genuine and high-quality aftermarket parts and continually update our inventory to meet growing demand. Looking for a specific part? Don’t hesitate to ask! We may have it in stock even if it’s not listed online. If not, we’ll do our best to source it for you. We’re also happy to provide guidance on installation and offer excellent after-sales support to ensure your satisfaction. Shipping Information We ship worldwide, carefully inspecting and securely packing all parts to ensure safe delivery. Your order will be insured and shipped quickly, with the best available shipping option chosen for speed and reliability. Please note: All parts are shipped from Cyprus (Europe). Customers outside the EU may incur additional import taxes based on the value of the item.