by Deon Kretschmer
(Xhora mouth, Eastern Cape, South Africa)
Engine losing power under load. 115 elpto, ran it on some very old fuel inadvertently. It spewed clouds of smoke and died. Replaced fuel, cleaned filters, removed and cleaned carbs. Idles and revs fine on mufs but breaks down and loses power under load. Whole motor shakes like a cylinder is firing intermittently. Tried another set of plugs. No change. Any advice will be appreciated.