Tomos has recommended a few different things, basically said its ok as long as its designed for automatic transmission use. I've found that Type A is best followed by Type F. Type A can sometimes be found as coastal unilube is still selling it. The tomos has a wet clutch, nothing fancy, nothing like the automatic in a car for sure. The transmission fluid must keep the bearings and gears lubricated (which atf isn't really the best but gets the job done) and the fluid shouldn't attack the soft cork clutch pads and adhesive, thats all. The truth is, if it wasn't for the sensitive clutches you could dump just about anything slippery in there. Some additives (not sure which ones) can attack the material causing it to swell and become useless. This is the reason its usually a good idea to avoid dexron/mercron/30w motor oil. Some people get away with using the wrong stuff and some people don't, without knowing what it is exactly that affects the material its hard to say what to avoid. Type A seems to be the most viscous out of the different types of transmission fluid which probably is a little better for the bearings and gears. Type F is similar in viscosity but its said to be a little more abrasive. I haven't noticed a difference between either and have had no noticeable wear to the corks over the last few years. Type A hasn't been used in the states for years, most automatic mopeds use type f. I'm not sure why tomos recommended or still recommends type A, since it was out of use before the tomos automatic lineup was even formed.
I recommend NGK plugs also.