I have flown fox 35 engines for years and yes you need a fuel with 5 to 10 percent nitro and at least 25 percent castor oil. No synthetic fuels like cool power should ever be ran in lapped bushing main motors. Fox 35 engines are known for a great 4-2-4 stunt run which means in level flight it wil...
Ya you need to lean it out a bit more! Nice engine