Thanks for all the feedback. So I should definitely buy a new signal generator gasket? How about the rubber gasket on the cover?
I have a Clymer manual and they make NO metion of ANY special tools. If I have the $6 tool, can't I just hold the nut with a regular open wrench and tighten the screw with the tool? That homemade thing is pretty clever, but I don't have any way of fashioning something like that at home.
BTW, according to the manual, You just have to take the seat and tank off to get the engine cover off. From what I've read here that doesn't seem exactly right. What else do you UNOFFICIALLY have to remove to get that cover off?