Interesting. About twenty years ago, I was asked to look at a cheap two-stroke strimmer somebody had bought from a discount warehouse. The owner described the engine as having erratic performance, difficult to start, and wouldn’t idle. My investigation determined a crankcase leak from an unusual source. The crankcase had a hole about 5 mm in it, the result of a flaw in the casting. The metal around the hole had lots of foreign material inclusions, which, by the time I’d cleaned them away, resulted in a much bigger hole. I contemplated various means of repair, before learning of Lumiweld rods. To cut a long story short, I used the Lumiweld rods with a normal small propane blowtorch. The assistance of another pair of hands was necessary- it was quite fiddling process - but the result was superb. The cheap strimmer started, idled, and revved perfectly.
