Has anyone tried the 4 stroke helvenco/ swissauto250 (aero version), Blackhawk paramotors imports them as interuder 250, on a part 103 ultralight? I’m rebuilding a kolb firestar, early single seat, and was looking at engines... light ones that might work. Polini Thor 250 ds, simonini victor. Any ideas? The helvenco is 4 stroke, 36hp, water cooled, EFI, and weights 69lb with oil and water.