Interestingly enough one of the Lazairs at last years Big Bay deal was running direct drive Solo's. Too bad that we don't know who this person is or anything about the set-up as this may help answer some questions.
Note also these Solo's are mounted to utilize the standard Rotax 185 mount and muffler. Rather than have air filters the engines are also equipped with stacks.
Note 2: If anyone has a doubt then I'll add this.......Rotax 185s have carbs on the right side of the engine not left side.