I got a poulan 2000 chainsaw for free. Compression seems ok. I'm wanting to revive it for personal use, but am banging my head w/ the carb. It has a walbro wt-20. I've replaced the fuel lines and filter, etc. It still will not start. It will run for a couple of seconds if I dump gas into the cylinder. I've disassembled the carb (including pulling the welch plugs), soaked it in carb cleaner for three days, put in new gasktets, new needle & lever. I've disassebled it a few more times to make sure every orifice and passage is clean and I really think they are clean. This is the first walbro w/ welch plugs I've rebuilt and am not really very familiar with those. I did put them back in and flattened them down with punches. I have not sealed them with fingernail polish yet. Can not sealing the welch plugs actually cause it to not even start at all? I was wanting to make sure it would at least try to run before I painted the welch plugs. Anyway, do any of you have any suggestions or something I may have missed? I'd rather not buy a new carb because it's not worth it on this old junker; unless someone knows a source to get them cheap. (wt-20 interchanges with wt-309) thanks.