Hello,
If your 450 is a late model it probably has a Magneti Marelli BAE700 Coil on plug ignition coil. The primary resistance is 0.65 ohms and the secondry is 8.7k ohms.
Looking at the connector on the coil the pin numbering goes from the right to the left. the primary coil is across pins 1 & 3 and the secondry is across 2 and the plug connection.
Stu
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