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Briggs and Stratton does not release specific compression values. Anything above 120 psi should be just fine, around 90-100 and you're most likely due for a rebuild. A better test is a leakdown test, with can help in determining where compression is being lost.
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Spark plug gap for a 1970 3hp Briggs and stratton engine?
The thickness of a cardboard from a cigarette box.
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My daughters mini bike with a 3hp Briggs has 80psi compression and runs great. A motor I got "running" off eBay has 55psi compression, runs but has NO power. -Jason
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