I did the oil and the tappets a few months ago I put in 20/50 oil and have been topping up with the same. Tappets are still noisey I need to tighten them a bit more, I was a bit nervous I didn't want to overtighten them and then the valves not closing fully.
Can the stem seals be done with the head still on, is there a guide on the internet of how to do it the haynes manual seems to be lacking this information.