I think the fumes from the petrol engine might cause problems too - even if it did have a good starter motor and automatic choke. It would be too automatic a choking experience. I like the solar hat/leg warmer concept. The solar panel on the hat, which would double up as a non-stick frying surface on very hot days, would be connected to heating elements in the woolen leg warmers. Since, under direct sunlight, the legs probably won't need warming, a secondary device, using modern fridge technology, will be able to kick in, using the solar power and a vat of coolant, kept in a backpack on the user's... er... back... will circulate through the leg warmers, making them into leg coolers.

And you'll be able to make ice cream too.