Oil leak

1994 500 Bullet. Been sitting for a year. First ride out, oil on centre stand and rear wheel on LH side. I presume this is the engine sprocket seal? Anything to watch out for when pulling down. A least one puller required I guess? Thaks

Wash carefully and fully. With petrol or similar. Drive short distance back to shop and examination with a strong light. Increase the distance
if nothing obvious. Useful to rewipe after ride with paper towels as any dribble will show up.