The FA90 MkII is a twin engine that came out in the early 80's. Excellent engine. PM me your address and I'll send you a copy of the instruction sheet.

It has a dual carb and you must set both cylinders. Not hard to do but it takes a touch. Same with the air bleed idle. Great engine. I run mine on 10% nitro and a 14x6 prop.

There are no reed valves or anything like that. There are two standard airbleed carbs in one aluminum block. You can't see the rotor turn as there is a 90 degree bend or turn in the airflow.