I have a used FS 40 mounted in a cub @ 90'. I have Cool Power 4 stroke fuel, new OS F plug and a MAS 11 - 5 prop. It starts great, revs great but wants to bark, spit and die at lower speeds with the glow clip removed.
What else can I try so I will be able to land this with the engine still running. Now the most reliable idle is too high for a good landing.
I forgot to mention that my engine only has the header pipe and therefore I have no muffler pressure to the tank.
Thanks,

ZB