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Hi, gap should be 8 thou. Try this with a new plug. Check the magnets on the flywheel. It is possible to have a faulty new magneto but not that likely. Also check that the sparkplug terminal is contacting through the high tension lead correctly. Regards Phil.
DO you have spark?? To check for spark pull spark plug out. With the spark plug connected lay the spark plug on the block of the engine( something metal) and try to start the engine.waych for aspark as the engie is turning over. Does it spark?? If not check the safty switches - Break petal, seat,blade engagemment switch. Also check the coil/magneto.(without the right tester for goil ) you will have to replace the goil. A little pricey. If you have spsrk, the problem is in the fuel system. Is there gas in the tank? Does the tractor have a fuel shut off in the gass line? Is it open?
Close the fuel shut off valve or crimp the fuel line with vice grips or some type of locking plyers. Remove the carborator bowel. Is there gas in it? Yes, Carborator needs cleaning. No, open the fuel line and see if fuel flows out of line. If not check and see if obstruction on line or tank.
Most importantly is the spark/ ignition system. mainly the safty switches and the coil/magneto. If any ofthe safties are open you will not get ANY spark. If the switches are working correctly I suspect it will be the the coil.
pull a wire and ground it via useing a screw driver at the end of the spark plug boot to check for spark / if their is no spark / ignition control module / there is also a crank shaft position sensor / located on the back side of the motor under the coil packs / pain to get to / also the nuetral safty switch / to check the neutral safty switch diconnect the big harnest at the neutral safty switch put a fuse tester to the yellow wire / have someone turn the key / with the tester grounded the light should come on / now we know the ignition switch has power going through it. if there is a no power at the yellow wire / bad ignition switch / does the car have a relay located at the top of the radiator core support (up by the radiator looking down drivers side)if it does not gm will install one for free / if there is / look for the purple wire coming out of the relay and Follow it down to the starter / reconnect the neutral safty swtch / touch the small S (the smallest screw) terminal on the starter soilenoid / have someone turn the key forward check the light / this will detemine if the relay is good / CAREFULL NOT to touch the big starter wire with the little one it will jump the starter / I HAVE THE SAME CAR / Hope this helps