I have a NIB YS .61 Long stroke RE and a Hatori/Futaba Pipe (Part # Y00030) that is going in a LA-1 (18 years old and never flown).

I need to know what I should do for pipe length and a reminder how to measure. I remember something like glow plug to "fat part" of the pipe but not sure. I'll be running 30% Heli fuel and an APC prop but also need to be reminded of the "right size" for this engine and this plane. 12 x 10 comes to mind?? The plane is a tail dragger so if I need more diameter, es no problema. Just some idears will be great and I can test from there.

Thanks,
Scott