So last weekend was closing weekend at our dunes here in MI. Friday was the best conditions I probably ever have rode on. For about 25 minutes I was running it as hard as I possibly could, wide open pretty much the whole time. Was hitting a jump that was up about half way up the 150′ hill as fast as I could go which at take off was 63mph then I would turn around and jump down the hill. When I finally stopped and engine went to an idle it was making the same noise when you first start it until oil pressure builds up. If I hit the throttle it would go away but back to idle did the same thing? After sitting for 20 minutes I fired it up and immediately drove off and when I let it go back to an idle it was totally normal and have not has not came back. Could all the oil been up in the head and it was starving at an idle? Guess that really doesn’t make sense but this whole thing don’t make sense. Oil level is just a hair over the full mark? Anyone run into this? Still runs perfect and no power loss.