![]() ![]() With the constant pressure on them, oil is pushed out of the weak spots on the gaskets which causes a leak. It is inevitable for gaskets to, at some point, shrink and crack and become less effective at their job. Motorcycle gasket locations will vary slightly, but you can look in these general areas of your motorcycle to find the main gaskets. ![]() The oil pan gasket is located underneath the engine (green arrows), the valve cover gasket is located on the top of the engine (red circles), the crankcase gasket is located on the side of the engine (yellow circle), and the cylinder head gasket is located in the mid level of the engine fins (blue circles). I’ll use the picture above as a better visual reference. These are the four most common gaskets to leak in a motorcycle engine because they see the highest internal pressure and oil can push out between those meeting surfaces if they aren’t doing their job. The main gaskets that end up leaking are the oil pan gasket, valve cover gasket, crankcase gasket, and cylinder head gasket. The first main reason why motorcycles leak oil is because of faulty gaskets on the engine. It happens to most of us motorcycle owners, even the ones who take good care of their vehicles. You’re not alone if you’re frustrated with your motorcycle leak. It’s embarrassing parking a leaking motorcycle in a public place only to find that there’s a nice little puddle underneath it. Oil leaks can be messy and they can be annoying. Through my experience and my knowledge as an engineer, I can clearly explain how the leaks happen and how to stop/prevent them from happening in the future. I have owned over a dozen motorcycles and experienced many oil leaks with most of them. The second most common reason a motorcycle leaks oil is from faulty plugs such as the oil drain plug, crankcase side plugs, and valve cover plugs. So why is my motorcycle leaking oil? One of the most common reasons why a motorcycle leaks oil is due to faulty gaskets found on the oil pan, valve cover, crankcase, or the cylinder head of the engine. Oil leaks are somewhat common among motorcycles. Motorcycle engine oil leaks can be a bit scary and mysterious because the underlying problem could be multiple things. One of those things may include engine oil leaks. Though motorcycles are simpler machines, there are a few things about them that can leave us owners scratching our heads.
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