Richard, Sorry to hear about your Hellcat. Saitos can be a bear to adjust at times. I had three deadsticks on my GP Spacewearker until am friend adjuusted the low end, Saito .91. He said I had to lean . It ran fine while on the ground but once airborne it would die. I was lucky I only bent the gear and broke a prop on each deadstick. I had a Saito .50 that I was running real rich to break it in and was flying it in a Tiger Moth and we couldn't get it to lean out at all. The low end was so rich that I had little or no high end adjustment. The gap on the spray bar was supposed to be one mil I believe mine was more like a 1/16 of an inch. I never have had the same problems with any of my OS fs engines. Set and forget