Congratulations on doing that valve adjust yourself! One thing for certain is, it is a much simpler job on an 1100 than a 1300, not having to deal with the timing chain.Just finished up first valve check and adjustment I've done vs. paying a shop to do it.
Question I have is re those reusable gaskets for the valve covers. Manual tells you to use gasket sealer on the 4 half moons when reassembling although I note in the video I watched the guy did not appear to use anything. The shop that previously did my valve adjustment certainly used some and it a bear to remove. I was thinking about using Permatex gasket remover but I'm concerned it might damage the rubber gasket.
So 2 questions here. Is it absolutely necessary to use gasket sealer on the valve cover gasket and how do people get the residual gasket material off of the gasket?
The sealer around the half moons is highly recommended. You don't want to have to go back in to do it, if a leak appears. Cleaning off old sealant can be a pain, unless you use a silicone type, which does come off easily. Pretty much just peels off. I use Permatex Blue and I put a very tiny bead of it around the entire gasket to cover side. This is not necessary, but it does help keep the gasket in place as you invert it for installation onto the head.
If yours won't clean up easily, buy new ones and then use the Permatex for trouble free checks in the future.