Originally Posted by trumpetporvida
I understood that, I guess what I meant was, is it the new carbs using the rotary valve that are having the problems with cold starts, or is it another factor?
I did some checking online and by looking at the parts lists, it seems that all the Kawasaki and Redmax trimmers that have gotten the most complaints for hard starting and long warm ups all share a common carburetor: the Walbro WYA
series. I'm not saying that's the culprit; I'm just saying it's one of the common denominators.