If you look in your oil sight glass and the oil looks milky, you possibly have water in your oil. This is a serious issue that can cause damage to your bike. The most likely cause of water in your oil is a blown head gasket, which allows coolant to leak into the oil. When this happens, it's important to get your bike to a mechanic as soon as possible.
Another possibility is that the air filter is dirty, which can cause oil to foam and look milky. Other possible causes include a cracked cylinder head or a damaged oil cooler.
Regardless of the cause, it's important to get the problem diagnosed and fixed as soon as possible to prevent further damage to your bike.
