I've done alot, but the radio is still getting interference. It seems to be getting worse.

Suggested mods done:
* separate ignition wires from servo wires
* replace metal throttle cable with nylon cable
* move ignition battery toggle switch to the front near the firewall
* move RX battery towards the back
* move RX battery switch towards the back
[edit]* checked spark plug cap is pushed in all the way, past hex nut

Suggested mods not yet done:
* solder ground wire between HT braiding and engine mount bolt
* move RX antenna further away from servo wires

Questions:
* Does it matter that I'm using PPM on 72Mhz?
* A friend has a CDI module for a BME-50 engine; and he offered to loan it to me for testing. Is it compatible with my XYZ 26cc engine?