There is a hole and it takes care of the air/fuel mix from idle to 1/4 throttle. You can hold the jet in the bend of your finger and try to plug all the holes in the stem but the one closest to the threads and squirt gum cutter thru that hole and you should get a good stream out the small hole in the end. You need the little plastic pipe connection on the nozzle of the can and you need to cover the hole in the jet with the end of that plastic pipe. If you site down the throat of the carb you will see a small opening on the side of the throat that may or may not have a jet in it. If you follow that line the next thing is the pilot jet that we are talking about and finally the air screw that controls the mixture. The pilot jet gets air thru the small hole, the air goes thru the holes in the sides of the jet and comes out the small hole in the end. That small dimple on the end of the jet provides a surface for the jet to seal when you screw it in, the jet has no path to outside air.

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