I've been working on a 2004 Lawn Boy 10323 that doesn't have any power. It's my father's and I'm trying to fix it for him. He told me that last year it started losing power and was hard to start. This year, it had no spark so I changed the coil. It started right up but wouldn't run right. The carb was dirty so I cleaned it and added a fuel filter. I put in a fresh NGK BMR4A, fresh fuel with Lawn Boy oil mixed at 32:1, cleaned the air filter and made sure the choke wasn't stuck and the governor was working properly. When I removed the cover over the exhaust transfer pipe, raw fuel came out. I replaced the needle and seat and set the float to 1/2" as I read on this site. The exhaust port was clean but the muffler was a little dirty. I cleaned it up, reassembled everything and it starts up but after a couple of minutes, it loses power and doesn't want to run. The only thing I can guess is wrong is the reed is bad. It doesn't surge or act like it has an air leak. Apparently, from looking at the short block exploded view from Lawn Boy, you have to split the engine cases to replace the reed. What else could it be?