Just changed oil in my XR600. Emptied crankcase and reservoir. Put in 1 quart and idled for a minute then filled it up. Total of nearly 3 quarts! Drove it around for 2-3 minutes and checked level.... near the top. Opened side plug and had some oil slowly come out maybe 3-4 ounces. Bike has few miles (under 10K). Is this normal? Engine sounded ok. No smoke.