Can't get waverunner started. Oil indicator light flashes. Check oil level, full. Check oil filter, seemed clear. Had it in the shop a month ago for starting problems. They said excess oil in in the intake. They cleaned it out and got it started. When I bring home two week later and want to run it, I can't get it started. Has plenty of gas and oil. Can't figure out why oil light flashes and won't start. Anyone got ideas? Thanks.