I have a 450 E Series Briggs & Stratton lawn mower push mower I tried to start it will not start changed the spark plug check the Magneto and that's fine I cleaned the carburetor checked fly wheel and key all wiring all is good..but it still wont start.Any answers.

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In order for there to be a spark at the plug, make sure the plug is grounded to the engine, it will not "fire" if it isn't.

Remove the cover with the crankrope, there should be a thin black wire going to the coil, going to a ground lug that kills the engine. Try unplugging this wire and re-check the fire...if it fires, there is a fault in this wire and should be replaced. The mower will run without it, but will not stop without "choking" out the engine

SOURCE: not firing

After you check the key and key way,Check the coil wire to see if it has any breaks in it,If no breaks are present,Replace the coil.

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check the fly wheel and coil it may have rust on it if so sand it off

Wade Mobley

• 513 Answers
• Posted on Jul 05, 2009

SOURCE: Craftsman Lawn Tractor/ hard start/ whitish smoke

does it turn over slow or fast if it turns slowly thats the problem so it could be battery or starter they have to have a good amount of rpms to burn fuel right when starting if not it floods out the engine with gas hope this helps thanks wade

SOURCE: Lawn mower won't start

to check for firing remove the spark plug insert it in the plug boot and pull the rope while watching to see if the plug sparks be carefull not to touch the plug electrode while pulling the rope or it will shock you. If you don't have a spark, try a different plug. If still no spark the coil could be bad.