I woldn't look at HP numbers......
just take nova based engines for example.......
the Nova NSR3 accorindg to Novarossi is 1.54hp......
the same engine sold by Serpent was the NovaMega SS3.......according to Serpent 1.8hp.......
and the same engine which is supposedly hand tuned by Massimo Fantini and uses the same parts of the NSR3, according to NovaMAX is 1.35hp............
funny.....isn't it?????
regarding brazilian climate......I live in Brazil, near to Jundiai and I stayed there during the WC.......the WC was held under high umidity conditions........temperature around 30ºC, the weather was rainy in few days.....