O: ng900 b206 mootoriplokki
The B206 is a version of B204 but without the double balance shafts. It was only offered as a naturally aspirated engine B206I producing 133 hp (99 kW), seemingly a Europe-only option in 1994-1996 non turbo 900 NGs. This engine is popular among Saab tuners in Sweden (e.g. Trollspeed) due to the lack of balance shafts but with presumably equal strength as the turbo blocks with balance shafts.