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Remove the muffler and make sure your ring isn't seized to the piston. You should be able to move it feely. If you can't isn't not likely you're going to get it to start. Check compression too. Sometimes there simply isn't enough compression to fire the plug no matter how much spark and how much fuel.
I recently bought a brand new 372XP and spent the first day trying to start it as per the instruction manual with no success, never even fired once. Removed the plug to find plenty of fuel and that the plug has a good spark. Left it until the next day mainly to allow my arm to recover (& scour the internet for clues). I found a forum that said not to use the decompressor and sure enough without the use of the decompressor button it fired first go with the choke on then I reset the choke & it ran properly on the second pull. The decompressor button can be reset with fine nosed pliers or removal of the top cover by undoing three screws. Good luck it's a great saw once you know how to start it.
Did you check for spark of assume that since the spark plug was not dirty that it is not firing. I am leaning toward water in the gas since you have to keep the choke on and it is blowing white smoke. You may want to drain the fuel tank and carburator and put in fresh gas. Good luck!
i would take the plug out and and the spark plug wire on the plug and try cranking it over and make the plug is firing if there is no fire then the ignition coil is dead but if you have fire then its a carb problem rarely ever a timing considering most mowers are timed with key ways which prevent them from jumping time.but if you have fire your good their but my overall suggestion is to rebuild the carb and swap out the spark plug if the mower has set for a period of 6 months or longer.
You need 3 things for an engine to run; spark, fuel and compression. How is the compression? Is the spark plug new? If the plug is old, it could give a nice spark when you check it but have no spark under compression. Make sure the fuel you're using is fresh. If you give it a small shot of starting fluid and it fires up, your fuel delivery is suspect. In that case, you will need to remove the carb an THOROUGHLY clean it paying close attention to jets and passages. I always give people this warning: when cleaning jets and passages, NEVER use steel instruments. Use wood, copper wire or other materials that are softer than the material you're working on or you run the risk of ruining jets or even the entire carburetor.
If you can get it to fire by adding a small amount of the fuel/oil mix directly into the air intake, then you have a fuel system problem and either the carb or fuel line are at fault. Depending upon the amount of use the trimmer has had, it can also be an ehaust port constricted with carbon.
Possible bad coil pack, since the plugs are not firing work you way back to the coil pack which is the 50k-70k volttage box that send the sparks through your wires to your plugs.
DID YOU REMOVE THE PLUG AND CHECK THE SPARK AT THE GAP? IF YOU HAVE FIRE THERE THEN THE PROBLEM MUST BE A FUEL PROBLEM. ARE YOU USING A FRESH GAS MIXTURE? YOU CAN PUT A FEW DROPS OF MIXED GAS IN CYLINDER THEN RE-INSTALL PLUG TO SEE IF IT FIRES, IF IT DOES THEN YOUR NOT GETTING GAS FROM THE CARB.POSSIBLE STUCK DIAPHRAGM. GOOD LUCK!!!
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