- Damaged or misaligned primary gasket: The primary gasket creates a seal between the primary case and the engine. A damaged or misaligned primary gasket can allow motor oil to leak into the primary case.
- Damaged crankcase breather: The crankcase breather allows excess pressure to escape from the crankcase. A damaged or blocked crankcase breather can cause pressure to build up inside the crankcase, forcing motor oil through the primary gasket.
- Damaged or loose oil drain plug: The oil drain plug creates a seal at the bottom of the crankcase. A damaged or loose oil drain plug can allow motor oil to leak from the crankcase into the primary case.
- Damaged or loose primary cover gasket: The primary cover gasket creates a seal between the primary cover and the engine case. A damaged or loose primary cover gasket can allow motor oil to leak from the primary case.
_Note: It's important to be aware that riding with a leaking motor oil into the primary case can cause damage to your motorcycle. If you suspect that your motorcycle is leaking motor oil, it's important to have it inspected by a qualified motorcycle mechanic as soon as possible._
