First thing I took note of was the fuel filter. I'll bet it's rubbing on the engine. Second thing is the throttle/choke control rods. If it is metal or CF change it because it will act as an antenna.

If you absolutely must have the servos where they are you could always wrap the servo wires around a choke ring. This will help with shielding the servos from tranmitting RF back to the receiver. But again replace those rods. extend the throttle and choke arms if you have too.

http://www.horizonhobby.com/Products...ProdID=JRPA029 (RF Filter rings)

Standard distance from any part of the ignition to any part of connected to the RX is 12 inches. Some planes just will not allow this.

Definitely never put the ignition battery next to the receiver. That battery will definitely transmit RF as it picks up the firing pulses right from the ignition.

Also check your switches. You should be using heavy duty switches on both the ignition and RX. The smaller standard switches cannot take gas engine vibrations and in a very short time will fail

You also want to wrap you plug wire with some of the spiral style automotive cable sheething. Also make sure ALL wires are tied fown so they cannot rub on anything sharp. Both wires coming from the ignition module are prime for rubbing on the edge of the engine box and engine mounting bolts. If they are already rubbed through, then they will need to be replaced. If the metal sheilding on the spark plug wire is frayed, which it looks like it might be, then that will also break the ground it is providing to the ignition module and really play havoc. The throttle servo wire is also rubbing on the hole and will eventually be cut.

Remember, gas engines vibrate and you need to take that into account when doing a gas installation. The prop must also be balanced to help reduce vibrations plus an unbalanced prop will not allow the engine to make it's best power and could easily damage the engine. Balance includes both the blades and hub.

http://www.downonthedeck.com on the left side under "instructional" are some very good videos, especially the one about prop balancing.

Also check out http://www.teamflyingcirkus.com, under the video section, for gas setup recommendations.