It's been awhile since I've been here and you guys have always fixed my wagons in the past so I hope you can do the same this time.
Well, I have this Masport mower with a B&S 550Ex engine. The problem is surging and I have thoroughly cleaned the carburetor but the problem remains. I tried a second clean carburetor and got the same result. Normally on other engines the source of this problem is lean mixture and a carby clean fixes it but this one has me stumped. I have also changed out the spark plug and the problem, remains. Any suggestions what else I should try?
