Question about Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model
My dyt 4000 18.5 hp 42 inch deck will crank but won't fire. I have changed the plug,air filter,& fuel filter. HELP Please
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.
Posted on Aug 15, 2009
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Posted on Jan 02, 2017
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