I built this motor a little over a year ago, it's a 66.5mm piston, trail ported engine with PJ34mm Keilin carbs, Vforce 3 reeds,stock bottom end. I am running a 150 main and have a little bit of a bog in 1st and 2nd gear if you get on the throttle pretty quick. I have the air screws out 1 1/2 turns right now and I'm not sure what to do to get the little bit of bog out of it. If you roll into it, it is not that bad. I'm trying to get a little advice on fine tuning the carbs. I'm not sure if I should mess with the air screws more or change my jets and which way if I do.