Easy to see if the primer is working ok, tip a teaspoon of petrol into the carby and if it starts straight up you can assume the primer isn't putting in enough fuel. I always pull the cable off and hang it up and dribble oil down through it.Just because it stops when the throttle is in the stop position doesn't mean a lot, it is what happens where the cable is atatched to the side of the cowling, you have to get that set correctly as well
