T5 slow running jet/pilot jet help

Hi all!

 

I have a t5 with a polini kit, stock timing, pm exhaust, 26G carb & 21t cosa clutch. It runs great except for having slow off the mark performance as it seems to bog at low rpm. I have tried main jets from 116 to 125, 24G carb, various exhausts & still can't seem to fix the slow accleration in first gear. I have come to the conclusion that it's got to be the slow running jet. I have seen on a few sites that with a hole drilled in the airfilter you should use a 100/100 jet. I have never seen this jet advertised & was wondering if it really exsists!! Does anyone know if this jet is avaliable & if it will fix the problems I have described.

 

Thanks in advance!

 

Croydon