I would think the Bobcat would always be prone to running rich with the tank
mounted in front of the engine....in the same manner as an engine would be
prone to running lean with the tank mounted behind the engine. This is, of
course applied to upright mounted engines.
I would think the Tower engine would not need to be leaned more that 1 to 200
rpm static, to avoid over richness in the air. I was using a YS engine that has it's
own pump and pressure issues, so gravity and thrust were not a factor.
I will find out soon enough with my Tower 75 in the Bobcat.
FBD.