Not really a practical idea when you look at the small compact generators available for campers and such. I would think the cooling fan would require a huge chunk of the power you'd be generating; then you have the noise and exhaust to deal with. Hate to be a wet blanket but it doesn't sound promising at first view.
Some time back there was another thread about alternate uses for the Chinese 2 strokes. Boats were mentioned as well as several other ideas. It is generally thought however that due to the specialization of design that they lend themselves best to the task of haulin' our butts around on a bicycle.