Keihin cv34

Hello, I wanna know whats the function of the small one Main jet of The Cv34mm ?! Its a stock one 62.. I understand the pilot and Needle Jet (2nd Main jet) function.. but whats the function of the small one just under the secondary Main ?! do I need to play with it or just change the secondary.. Thank you 

Starter jet, pilot jet, main jet.

Fuel for the bike to start (catch).   Fuel for the bike to idle.   Fuel for the bike to run

The CV34's have a three stage jetting system: pilot, primary main, secondary main.  Each comes in at different times, depending on the engine's air demands.

Yes I know they had a time for each other! !  0-1/4 is pilot, 1/4-3/4 is Needle, 3/4- Cut off is main jet(needle jet) .. thats right?! If yes, when the small one main is active ?! 

wrote:

Yes I know they had a time for each other! !  0-1/4 is pilot, 1/4-3/4 is Needle, 3/4- Cut off is main jet(needle jet) .. thats right?! If yes, when the small one main is active ?! 

I'm not sure if your description is exactly correct, but clearly, all the jets are active at some point in the bike's running range.

If you are looking for a short cut when running pods, then a Dynojet kit is the answer.  And get real K&N pods.