Russell, What have you checked when engine stalls! try H/T first,take any plug lead of and connect it to a good used plug hold it on to the cyl head with insulated pliers
crank the engine and look for a good spark,if you have then fuel starvation is the possible cause, if not then look at checking the coil, unplug coil lead from distributor cap do the same test as above,and look for a good spark, still no spark then possible igniter or faulty coil, if all o/k then check fuel supply to carbs, fuel pump etc.
Stu.