Got Ultra RC Giles with tank back about 8-10" so it is over the CG. put on Perry pump per instructions (Taped center of backplate). cool power 10%. APC 18x6W. Moose can type tuned pipe. No cowling yet. We cant get a good running setup yet. Engine is used but in good shape. Ran perfect on big OMP 80" profile Yak, without pump.

What are your needles set at?
Tuning tips for Perry pump?