Tinsink a carb off of a chainsaw around 36 cc will work good most around that cc will bolt up to the weed eater but you have to port on the intake spacer. I got a big bore carb a few years ago frm the hobbie shop they only only had one and dont remember the #s from it,but was around $40-45 bucks.The carb I have on my homelite now is off of a 36cc poulan chainsaw.so im shure abt all of them interchange.you just have to make shure the small hole from the head to the carb spacer to the carb is lined up or isnt blocked,and if your going gas/glow you have to drill it out a little bigger and adjustments on carb.I think a few pages back on here someone posted abt a 11mm carb works great, I dont remember for shure.I think it was av8tor.