For the motorcycle guys. Oil leak on R1

Started my 2000 YZF-R1 wednesday for the first time this year. Upon starting it, oil started pouring out of the oil filter. whole crankcase within about a minute. I changed the oil and put a new filter on and started it up again... same thing. Oil everywhere. Yesterday i brought home some cheap bulk oil and brake cleaner, unscrewed and rescrewed on the oil filter to check for tears in the gasket, cleaned off all the oil, topped off the oil and cranked it over, no leak, started it and revved it. still no leak. changed the oil and filter again to good oil and no leak. Anyone know what might be the issue? The only thing i can think of is something plugging up the oil system and causing pressure buildup at the oil filter.