Why is gear oil blowing out breather hose on my kawasaki 220?

Gear oil blowing out of the breather hose on your Kawasaki 220 could be due to excessive pressure buildup in the gear case, often caused by overheating or overfilling the oil. It could also indicate a failing seal or gasket, allowing air and oil to escape. Additionally, a blocked breather vent can prevent proper venting, leading to oil being forced out under pressure. Checking the oil level, ensuring proper ventilation, and inspecting for leaks or blockages can help resolve the issue.