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How can I fix my 14.5 Briggs and Stratton lawnmower ignition timing?

My ignition timing is too advanced. How can I slow it down to stop the popping and flat battery effects?
Alan Pelt, September 2007
Check your valve adjustment and also inspect your flywheel key for any deformation if any at all replace it.

dooperdog, February 2009
Ignition Timing is not the problem. Valve timing is out. Check valve clearances. 0.008" Exhaust 0.006" Inlet

John K, January 2008
I have the same problem could you answer?

Earl Cushman, September 2007
link Click here to see other fixes for Briggs & Stratton.