with any tough to trace oil leaks, i spray heavy duty cleaner on the engine, let it sit for a few minutes, and then spray it off with a garden hose. i unplug the spark plug wires from the dizzy and tightly wrap it in a plastic bag, just to keep most of the moisture out of there, and i avoid spraying it directly. not a big deal if some moisture gets in because it will dry out but i like to avoid it in the first place. after the engine is good and clean, i can go for a drive or two and then clearly see where the leak is originating from.
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