the 30cc or 50cc pump feeds the nozzles . no matter the size of the nozzle you are only gonna get 30cc or 50cc of fuel . theoretically at least . probably a hair less depending on lever angle/pressure and cam etc . and i think that cc rating is per 10 full "pumps" . so a larger nozzle will be a larger shot/volume of fuel at less duration . smaller nozzle will be a smaller volume over a longer period of time . the cam , just like the engine cam creating lift , controls amount of fuel via lift and also controls the timing rate - more fuel early rotation or more late rotation . also the #1 or #2 hole makes a dif . the pink cam is supposed to give you a full even shot and is probably a good cam to start with . i think the brown cam is for the 50cc . as far as the cam's go stay with the basics until you learn it well .