Originally Posted by gunnerbuck
For locating and holding the engine at TDC there is a locating bolt on the shifter side on the front of the engine beside the spin on filter. Remove this 8mm bolt, shine a flashlight in and when the engine is at TDC with the valves slack you will see a recess cutout in the crankshaft. You can use KTM part #580 30 080 000 to screw in this hole and engage the cutout to in effect lock the crankshaft at TDC while you work on the engine. I made my own locating screw by using a 8mm stud, grind a point on one end and a screw driver slot on the other so you can turn it in. I prefer this unit to the KTM unit as it clears the oil filter better.
I think gunnerbuck said it all right here. I will try this out next time. I will have a look today and see if I can find it. My mark should be right in the window.