I have a custom hard tail that I have ridden since 1998 when it was built. It has a 96” S&S Evo that has started building up so much pressure that it has blown the oil cap off twice and drenched the rear end of the bike as well as my own with scalding oil. The bike was out of service for about a year for some minor issues not related to the oiling system. I put it in a shop because it needed a carburetor kit which I have never done and a few other things. When I got it back it blew the cap on the way home. Does anyone have an idea why this has happened, it never has in the past.