I have had this Echo PB400 blower for 20 years! I use it for home yard work - a few times in the spring and more in the fall. I've had the carburator replaced a long time ago because it got too gummed up from lack of use & poor storage. Since then, I've learned how to winterize, etc., and the machine has been providing good service. I had to have the pull cord replaced this past spring. The repair guy was impressed with the 'like-new' condition of this blower. However, since then it's been extremely difficult to start. I don't think the starting problems are related to the repair. Here's what happens: I try to get it started the way I always do - choke on & partial throttle. I pull and pull; rest a while; close throttle; pull some more; change choke position; pull some more; remove air cleaner; open throttle just a bit; choke open just a bit; pull some more; unscrew gas cap; pull; replace it; pull; check plug; pull & pull & then it kicks over. This goes on for about a half hour! But at first it only will go at a very slow idle. If I try to give it too much gas it bogs & stalls. Then I slowly give it more gas and it slowly works its way up to full RPMs. In the meantime, I replace the air cleaner & then get set to do my work. I went through this this weekend. It runs fine once it gets going. I used up almost a full tank of gas doing my leaves and after refilling, it was hard to start again. Not as bad as from a cold start but it went through that same low idle until it could get going to full speed. It's not old gas; I use 2 cycle gas in my lawn mower so it's replaced enough to be fresh. It's not a bad plug - I get plenty of spark. I notice that when the blower is running, the choke position doesn't seem to have any effect. One time, I squirted some gas directly onto the piston and that got it to kick over. I need a new gas cap & should replace the fuel filter. But I don't think those are the major issues. What should I do? I've read about carburetor rebuilds. Should I do that? Or adjust the carb? Replace the carb? I've read about the spark arrestor problems. What bugs me is that once it does get going, it really works fine. This machine has a Walbro type WA carburetor. Where can I get rebuild kits for it? I want to do this fix myself because I'm sure the repair bill could not be justified for a 20-year old machine. Sorry to be so long-winded but please help!