Now the tricky bit

. There is a pin holding the right hand chain guide that HAS to be removed. The pin is threaded. I use a small sliding hammer for this. You could use a bolt and washers / small socket, to pull it out but experience has taught me to use (in this case) the right tool.
Remove the cam sprocket and take off, support the chain (to stop it falling into the sump) with a bungie cord (shown in next pic). Remove the three 13mm bolts that hold down the oil spray tube. Take it off and store it carefully after cleaning.
Remove the cam shaft / rocker caps. Half a turn at a time in a diagonal pattern, untill no tension is left on the bolts. Be careful of the shims that sit between the arm and the valve stem, keep them in order as the caps. Lay them on a piece of cardboard and number them off for clarity. Now we have a bare cam waiting to be carefully lifted out and placed on the cardboard.