I'd avoid those, they have mediocre quality.
The Ruggerini MD191 and Lombardini 25LD425-2 (same engine, really) are better options if you can find them. Significantly lighter weight, significantly better build quality.
And, not sure how Brazil's laws are, but in the US, running one of those on public roads is just as legal as running a diesel Smart engine - that is, not at all. (Unless you build a three-wheeler, and then license it as the one EPA-exempt motorcycle that you are allowed to build in your lifetime. Or, if you make a serial hybrid, with the generator not being a part of the vehicle, then it only needs to meet off-road emissions standards.)
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