I just put a new weber44 IDF on my 1915 and dont think i have the right jets in it. The ones came with it are 50s not sure if i need bigger or smaller or if thats even the problem. The problem is it will idle fine and it will go when start getting on it but in between idleing and getting on it, it will stall out unless i pump it a few times.

sounds like your idles are to little,try a 55 if it still has a flat spot in it go to 60

General rule of thumb..................

If your mixture screws are lass than one turn out, your idle jets are to big.
If your mixture screws are more than two turns out, your idle jets are to small.

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