I have a 2013 grizzly 700 after changing the spark plug and cleaning the air filter and checking the fuel injector I put everything back together and started it up. It started and ran fine but after about 5 mins of riding the oil check plug blew out and spewed oil every where. What would cause the oil pressure to build like that and not release, the owners Manuel is no help. I assume there's a pressure valve somewhere but I've checked the internet and so far no luck. Any advice would be appreciated