Hi guys. I'm the guy who has recently rebuilt a Stihl 038AV. The saw runs absolutely flawlessly but I'm having a few minor problems. The first is with the gas tank vent. The original hose that went on the tank fitting was rotted so I took a piece of small fuel line and screwed the two inserts into it. The tank is venting but after awhile gas seems to squirt out the hose past the inserts. Is this normal for this type of vent or can I do something about it? The other thing is with the air filter cover. I can't seem to engage the twist lock on the cover with the screw on the air filter. It seems like the nut that holds the carb in place is going down too far and the twist lock hits the carb stud and can't go down far enough to lock. If I loosely tighten the carb screw I can get the twist lock to engage but then when I try to remove the twist lock, the carb screw completely unscrews. Should I install a washer behind the carb nuts to push them out further? Any ideas guys? Oops, almost forgot. What is the max rpm this saw should run at? Right now the high speed screw is at about 1 1/8 turns out and the saw runs at about 11500 rpm.