Appeared in my email, thought I'd pass along. Important point in the applicability paragraph.
"The new ignition coil assemblies, new ignition cable set and new spark plug connectors have already been installed on all versions of certified and ASTM compliant ROTAX® engine types
912 i (Series), 915 i (Series) and 916 i (Series) from S/N 10011960 inclusive.
NOTE: It is not mandatory to retrofit engines which are currently equipped with old ignition coil assy. types, old ignition cable set types and old spark plug connector types.
NOTE: In case of interchange/repair/maintenance mixing of ignition cable types and spark plug connector types is not permitted. All ignition cable types and spark plug connec-
tors must be of the same part number for the entire engine.
NOTE: Installation of the new style ignition cable set (part no. 864758) and new style spark plug connector (part no. 265245) is permitted on old ignition coil assemblies."
Upshot is don't mix coils. If every thing is working ok now, nothing to do. If you replace a boot or ignition cable replace all 4 with same type, but you can use new style cable and boot on old coils. If replacing a coil, replace it all. At least thats my translation.
"The new ignition coil assemblies, new ignition cable set and new spark plug connectors have already been installed on all versions of certified and ASTM compliant ROTAX® engine types
912 i (Series), 915 i (Series) and 916 i (Series) from S/N 10011960 inclusive.
NOTE: It is not mandatory to retrofit engines which are currently equipped with old ignition coil assy. types, old ignition cable set types and old spark plug connector types.
NOTE: In case of interchange/repair/maintenance mixing of ignition cable types and spark plug connector types is not permitted. All ignition cable types and spark plug connec-
tors must be of the same part number for the entire engine.
NOTE: Installation of the new style ignition cable set (part no. 864758) and new style spark plug connector (part no. 265245) is permitted on old ignition coil assemblies."
Upshot is don't mix coils. If every thing is working ok now, nothing to do. If you replace a boot or ignition cable replace all 4 with same type, but you can use new style cable and boot on old coils. If replacing a coil, replace it all. At least thats my translation.