The auto plugs should have an R in the number. These are the resistor version of the standard plugs and will greatly reduce radio interference (Rotax changed their plugs to resistor type for this reason). If all else fails, buy some metal braid that is used for grounding straps, etc. Put it over the ignition wires from the plug to the distributor/magneto. Use heat shrink tubing at each end. Ground just one end of each wire at the distributor. If you ground both ends, then you have a conductor rather than a shield and it won't work.
I've done these two things to the Rotax 582 in my Renegade. I can hear people in the pattern at airports a hundred miles away. Jim Vance [email protected]
