I also switched out my needles, but when I did, I tore the o-ring on the msn. don't know why? anyway I haven't been able to try it out here in Canada, too cold, but am anxious to. Also the ball head on the carb where the servo arm connects, how do you get that off, I tried and stripped it, I didn't even turn it hard.

ps, CEN does have great service, and I am sticking with them.