This is on my Garelli SSXL. Polini, 19mm intake and carb, 110 main, 42 Idle, W9 needle. This thing just wont start with a filter on...E12 or UNI. I think the e12 is lame because its affect on top end (learned this from minarelly), and the UNI is OK. This engine slobbers fuel right off idle but Im running a 42 idle/pilot jet??? According to the PHBG wiki, the adjustment area of my screw (being all the way in/closed) indicates that I need a smaller idle jet, but I have never heard of anyone really running smaller than a 45? I really want to love this bike, she is sexy, smart, loving, but is a bitch to tune (oh and her clutch is reaaal tight adding to the tuning difficulties). Im going to switch to a 35 idle and w6 needle in the next few days but???