Fun! Wicked, but good fun. I have to say that the guy I have been dealing with has now offered to send me the agreed value of the engine as soon as he receives it, so he is playing by the rules. I will be out of pocket to the tune of two lots of international post, but that is the risk we take buying used, unseen from a distant country. The seller seems as shocked by the condition of the engine as I am; I suspect he bought it in to sell on and only glanced at the engine, as I did when it arrived. Only a more detailed inspection revealed its true condition.
I've bought an Irvine for the 4 star instead, not as 'sweet' as the 4 stroke, but it will fly and I won't have wasted my time in building it.