[scotty33]

Re: Timing mark on the bottom pof the engine? (ZX6R1033)

It is possible for the outer portion of the crank pulley to slip in relation to the inner part, the rubber bush can come 'unstuck' and cause this.
The easy way to be sure the crank is at tdc is to look in the 'window' on the gearbox bellhousing (This is roughly down below the distributor). You can see an index mark -0 which lines up with the flat side of the 'window' when No.1 is at tdc.

 

[scotty33]

Re: (ZX6R1033)

If the front pulley timing mark is nowhere near where it should be, then the rubber must have slipped in the damper part?
The O- mark on the flywheel is the only check you will be able to use - for crankshaft position, and yes it will likely be rusty, the only other mark there is -12 which I assume is 12 degrees off tdc?