Since you mentioned fragile...
Once you start making some power, you're gonna want to have your crank welded for strength and reliability...
Keep in mind, if you go 19 or 20cc domes, you'll probably need to run a mix of race and pump gas, or possibly straight race gas, depending on how much compression you end up with.
Ricky Stator makes good shit, period. However, as 2b said...unless you plan on running more or HUGE Bright lights, stock stator is more than sufficient. Just buy the timing plate for 35 bucks and be done....
Anytime you build your engine, i.e. pipes, carbs, porting, etc., it becomes more fragile than stock, period. However, when done right, you'll be fine with proper maintenance....
What do you have done to your bike right now, is the question...?