My 14 year old McCullough weedwacker was acting funny late last season, and I forgot about it's problems. Went to start it last weekend and after about 20 mins with starting fluid and fresh gas -it finally ran but would not idle, even with the idle speed screw adjusted to highest idle. I set it out in the garbage. Got to thinking about it, and I hate to part with old treliable tools (or cars, or anything else, that has given me years of trouble free service. I retrieved it from the garbage and proceeded to disassemble it. Sprayed all of the carb passages and cylinder bore with Seafoam spray and let it sit for 1/2 hour. Then I blew all the passages out with compressed air. Put it back together and after some high and low speed adjusting of the mixture it runs and idles like it did when new. I was going to replace it with a Shindaiwa weedeater for $245