What makes oil blow out a vent pipe on a 300 Honda ATV?

Oil can blow out of a vent pipe on a 300 Honda ATV due to overfilling the oil reservoir, which creates excessive pressure in the crankcase. Additionally, a faulty or clogged breather system can prevent proper ventilation, leading to oil escaping through the vent pipe. Another possible cause is excessive engine heat or a malfunctioning oil pump, which can also disrupt normal oil circulation and pressure. Regular maintenance and checks can help prevent these issues.