Do many people encounter a broken spokes with their 2 stroke 'ebay' type motors or is it worth getting a hub kit where the sprocket is attached to the hub rather than the spokes?
I'm 155 and run a 70 CC dax up steep hills wide open with a 44 T sprocket and have yet to break a spoke....My bike is a Specialized RockHopper...Totally stock ...Well except for the engine kit! ;-)
I wouldn't sweat it. I am 210 my bike was built in the 80s - Nishiki Colorado. My spokes are original and pretty rusted because it used to be my Trestles bike. I have yet to break a spoke and have been riding my bike pretty hard for the past 2 months. If you break a spoke, replace it or by a new set of wheels with thicker spokes.