Bull Pucky Had a friend of mine and club member with a large model and a 50 cc motor with electronic ignition.
Long story short Spectrum 2.4 system range checked great with engine off. Every thing (servos) jumped around like a spasdick
as soon as the engine started. Would not range check at 10 feet. Turned out that the electronic inignation cut off was too close to the antenna on one of the satalite receivers. Moved them apart and all interference quit and the Range check passed at over 130 ft. Go Figure.