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How to check ignintion system

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My B&S 12hp on my '73 Homelite has no spark. Checked pts/condensor and gap, all seem fine. I replaced them last year and it has been running fine till a month ago. Replaced ign switch today as it has been acting up for awhile, still no luck. How do I go about trouble shooting the system? I have a meter; but my electrical knowledge is limited. Thanks: Gary Hamilton

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