421 jetting 39 pwk

[sick421]

I have a 4mil cub , drag ported , 21cc domes , running sonoco 110 , sb cpi inframes , vf4, 10in pods , + 10 timing .

 

I was running 35mm airstriker and the jetting was perfect at 45p , 1 1/2 turns af, and 152m cel needle in the middle.

 

Now i switched to 39pwks , and im running 158m , 1/2 a turn on a a/f , cel needle in middle , and 52 pilot. It runs like crap it had tons more power with the 35s . It idles a little high and the low to mid range sucks . Top end rips .

 

All suggestions are appreciated .

 

 

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[locogato11283]

Pilot is too big. Put a 48 in it.

[sick421]

I tried a 48 and it felt like it was going to blow . Rpms were high

 

 

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