Flat-rate shop hours run close to $ 100 here in northern Virginia; for the work performed the bill isn't particularly out of line, IMHO. Regrettably high, the parts prices appear close to dealer list prices, also.
Yet, the shop owes you a skid plate and should address the screw issue, IMHO.
If you need a stock skid plate (not recommended; a more robust aluminum one preferred for any off-road riding); I have one I'll GIVE you--totally serviceable, came off my Generation 1 bike (if I can FIND it in the junk box!).
If you must go into the carb again, you can find a good primer by Googling, "Care and feeding of the CVK40." vatrader01 posted an excellent tutorial on carb tuning on this website.
All this said, if your bike is sound, you've still got a treasure! A battery and tires are expendables you MUST buy, and if the technical work is competent, you've the equivalent of a barely broken-in new bike!
Now, about the doohickey . . . doomsday, "The sky is falling!" alarmists will tell you you MUST upgrade your doohickey with an aftermarket part, or your engine will turn into a pumpkin at the stroke of midnight. While the deisgn of your Generation 1 doohickey (idler shaft lever) is questionable, such peril may be exaggerated. Not a bad idea to upgrade, plenty of videos and tutorials, do-it-yourself wise.
Bottom line; time-and-place, you weren't particularly savagely hosed; yet you're due yur skid plate and a serviceable screw (if the latter's the dealer's responsibility).
May the bad taste disappear, allowing you to enjoy your delicious bike!
Note on that stripped (I imagine you mean, "boogered screw head," vs. stripped threads) master cylinder reservoir screw: an IMPACT DRIVER is my tool of choice for removing these screws (wiithout boogering the screw heads; JIS bits help, too). GALVANIC CORROSION causes tenacious adhesion between the steel screws and the alloy casting, 'specially on a bike sitting as long as yours has. An impact driver applies torque only when the threads are relieved by a hammer blow, freeing stubborn fasteners (about $ 10 at Harbor Freight).
You might consider replacing the screws with Allen-head fasteners (same with the carb), to avoid future trauma.
Last edited by LoneRider; 03-27-2012 at 06:59 AM.