Small Engines (Lawn Mowers, etc.): echo weed eater, echo srm 210, guy folks

Question
Hi john, im so glad you're back.Ok, my weed eater was running fine, used it 2 days in a row for about 3 hours each day.3Rd day it started right up, but only ran at idle, even after warm up with choke open. Give it gas it dies. Im the local guy folks bring there equipment to, so I did everything you would tell me to do for cleaning and building the carb,encluding several overnites in gunk. Im thinking its somthing other than the carb. After talking to a guy at a shop, he says echo came out with 2 different coils, a step up, that advances timing at a certain rpm, the 2nd  I forget. but he says both have issues. and - my problem, fits the issues.Like the coil may be stuck (his words) in the retarded position.Would appreshiate any info you can give. And yes I did check muffler for build up. Thanks my friend. Echo srm-210 ser# 05150884 ps. at one point out of the blue it would excellerate and ran fine again. next day it was as Ive described.

Answer
 Hello Darryl:

 Thanks. Im Glad to be Back. The Friend at the Shop was Correct. There is an Issue with Some of the Coils that Echo is Using. Also, if you have Another Good Carburetor, then Use it to Check the Rebuilt Carburetor. Sometimes No Matter how I Try, I Can't Get Some of the Carburetors Clean After a Week of Soaking and Have to Replace them. Hope this Helps. I am here if you Require more Assistance. Thanks.

 Good Luck

 Respectfully

 John