SOURCE: john deere 425 mower won't start
The ignition switch module is likely to be the problem,they seem to quit for no good reason.The safety relays and fuses are built into the board that comes with the switch and will most likely fix your problem.
SOURCE: After the mower gets hot, it shuts down.
my john deere did the same thing i had spark and it did run,but the coil heated up an there was a short in it and it would stop and you wait awhile and it cool down and it would start again,i replaced the coil and the problem was gone.
SOURCE: Will crank but won't fire
To run, the engine needs fuel/air mix, compression, and a spark. See if you can narrow your problem down to one of these. Remove the plug, then connect the plug wire and set (or carefully hold) the base of the plug against the cylinder head. Crank the engine and see if there is a spark. If not, the problem is in the ignition system.
If you see a spark, replace the spark plug. Remove the air filter and pour about a tablespoon of gasoline down the carburetor throat. Crank the engine, being careful to stay away from the carburetor in case it backfires. If the engine fires and runs, then it probably is not getting gas (fuel system problem), or not getting enough gas (carburetor or choke problem).
Compression problems are less common, unless the engine has been abused somehow. You can check for compression with a compression gage. Remove the spark plug, install the compression gage in the spark plug hole, then crank the engine with the throttle open and the choke off. If you get at least 60 or 70 psi when you do this test, the compression is probably not the problem.
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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
check the solenoid on the bottom of the carb check for movement and power if it moves and has power open the carb and clean it
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