I have experience exactly what Lunatic describes. If it is't leaking anymore, don't worry about it.
If you are still consuming oil, but no sign of a leak, it could just be a little tired. I would use about 1 qt every 2000 miles of hard riding on an old M-2 with 65,000 miles on it. Even though the pistons, rings, cylinders were newer (1250 kit) and there was no tell-tale smoke it would still use oil, but not enough to mark up the plugs or make a 2-stroke trail.
Run it, have fun, and check your oil level often