From what she describes the engine is tired and none of the current push mower engines are worth the cost of a rebuild. Even on the off chance that you are right that starting fluid will eventually cause a problem it will have worn completely out long before the starting fluid gets it
take off the top of the mower-about six boltsand then clean the head and bushes on the alternator. use a bit of wire wool.9 times out of 10 these parts are coverved in old grass.
Am new to the newgroup, so that's why the tardiness for a reply.
If the engine is flooded, remove the spark plug and air filter. (if the engine valves are in the wrong position, the fuel can't dissipate in the engine) Walk away for about a half hour. Reassemble. Give it a few cranks. If doesn't start, prime per manufacturer's recommendations.
A new spark plug is always the first step with starting problems. Always keep a new one in the garage. If your lawn is a bit dusty, maybe the air filter is the culprit. Clean and oil the filter. Don't use old gas, over a month old including what's in the lawnmower's tank from the last mowing. If you've had a lot of rain and heavy morning fog and dew, could be water in the gas tank from condensation. Check the refill gas container for water droplets. Remove and dump the contents of the gas tank. Wash it out with a few ounces of charcoal lighter fluid. Let it dry for a day. Use a spray drying agent to assure its dry. Reassemble and fill the tank with new, uncontaminated gas.
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