I'm running these carbs on mine as well?? r u talking bout the small hole the side like a window into the needle rite? what size do I want to drill this out too? I think my pilot may be a little on the rich side I'm @ about 2000 elevation running 52 I think I'm gonna go to 50 or 48 cuz I don't do that much full throttle and my plugs get dark... when I run it hard (drag) the clean up so I'm thinking bout goin up on my main (172 Rite now), but I'm gonna do a plug chop first cuz I'm pretty close.... I have 40 over bore, ported reeds with petals, 19cc domes n cool head, Toomey T5's, Open Uni pods... I'm running half 110 half 91@ 40:1 yamalube....