Originally Posted by ArdusFlyer
Yeah. It was really the weight i was thinking about. I think the 2.5 or 3.5 hp motors from the big brands are a fair bit more than 9.8kg.
That in itself tells you something - companies with brands to protect are making more "substantial" offerings. As a rule, small engines don't like being neglected in a damp environment and then expected to come to life quickly. Of course aux engines need to be reliable, otherwise they are pointless.
Having said all that if you can afford to risk the money as an experiment it would be interesting so see how these engines actually perform and last as I don't think I've seen or heard of anyone with one.