Hi David,

We used to worry about metal to metal contact a lot. It's OK if the metal was tightly bolted together like a metal screw holding the engine to the mount, but a metal quick link to a metal throttle arm was a big no no and would just about guarantee radio interference. Doesn't matter what sort of motor it was the vibration. It doesn't seem to be such a problem with modern radios but I still wouldn't risk it.

A nylon quick link should fit straight on the throttle arm.

The ignition interference is a different thing.

Dave H