Fiberglass soecialties has a busa cub cowl without the engine detail. Whe were you looking for a bare cowl at? I am on my second 1/3 busa cub. Both have had g 62 on them. If built light they will keep flying with 3 clicks above idle on the trim.. A 100 would be awesome with some mods.. But if you just want to sport fly. A 50-60 cc is fine.. I may put an old zdz80 on my next one as they are really light and just a bit more power would be nice the way i fly. A 70 twin would be good too..