If you go with those crimpers (I have them) there are two sides. The A-B-C notches are used for the main crimp and curl both sides of the metal into the wire and give a perfect tight crimp. the C-D notches on the other side are for the strain relief (not all terminals have the strain relief area). These are not curled into the wire but are crimped down on top of the wire... Anyway, way more info than you need now, but if you are planning on messing with these connectors (or any others) very much, these make really nice work of the terminals.
With regard to the gaskets and sealants, as long as you don't have gouges or warping in your surfaces, the plain gasket with no sealant is the way to go. The oiling is a little tip that I learned on this site and really helps if you need to get back inside the motor again (keeps the paper from sticking and tearing). Also, I'm pretty sure those are all blind holes that are used to attach the side covers... there shouldn't be a need to use silicone to seal the bolts. If you want, a little dab of blue loctite can make sure they are secure, but I don't use it on side covers (but am a fan of it elsewhere) and I don't recall having a bolt work loose there.
Silicone RTV use on 3-wheelers is typically frowned upon in general, except in a very few places where a non-hardening sealant like Hondabond is called for (like the rocker cover on the 350x). Yes, people use it, but it is either not really needed in the first place or being used as a band-aid for something else being wrong (warps, gouges, cracks, poor fit, etc).
- Frank
1984 200ES Big Red
1985 350X (x2)
1986 350X
1986 250SX
1984 Auto-X
1984 ATC70
1985 ATC70