tell him that jets control the mixture of air and fuel that go into your carbs. your jetting is the size of the jets you have and you need to change your jets depending on your elevation and temperature because depending on those your engine will need more fuel or air.
carbs suck in air and gas, mix them together and sends it into the cylinders. with the help of reeds it is atomized, goes into the cylinder gets compressed fires bing bang boom your engine revs when you hit the throttle because you are opening your carb slides which brings in the air and fuel.
The pistons are what move up and down in the cylinders. the movement pulls the mixed gas and air from the carbs through the reeds. into the cylinders and then combusts inside the cylinder which causes causes power. the more throttle you give it the faster they go. rpms = revolutions per minute. your crank revolves which causes the pistons to move up and down.
porting has to do with removing material from the inside of your cylinders, reed cages, or carbs. when you grind away the metal leaving bigger ports you get more fuel and air in the cylinders which = more power.
i think. i dont really know what im talking about. i could be totally wrong. but from what ive gathered that sounds right. can anyone correct me?