I would check into a service improvement from the factory on these things. Is the ignition looking for a set oil pressure reading before allowing spark? Just a guess, slow to build to working pressure, kinda like a safety prior to start? Remember the old Clarks had oil pressure switches that kinda did the same thing. Tokk a while to start, looking for oil in the pan.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.