I degreased the engine and then ran it for about 10 mins varying the revs. I took the engine out and dusted it with athletes foot powder so I could see the oil on the engine. Makes it easier to see on a black engine. I put power between #2/3 cylinders for comparison both front and back. As you can see in the pictures the power has stuck to the oil. Now I have to work out where exactly all the oil is coming from. The bike was run on the center stand to avoid oil being blown through the fines. Looks like a possible leak from the tappet cover and somewhere else. Since the front of the engine leans slightly forward, the oil runs towards the front of the bike. From what I can see, it's a tad hard to get the oil from the tappet cover to run up to the air intake side of the engine and around the spark plug etc. Any thoughts?