I have recently aquired an old O.S 46 (Fx i do belive)I tuned it today it has a some what high idle speed and a great highend speed but it is very boggy(struggles to stay turning) at idle, i find the rpm pritty high for idle but any lower it will stop. it strugles to get to high rpms when u put stick foward and stops when you pull the stick back.

what is going on???

Adam