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not sure if this will help - but I had a lot of trouble with my stx38 (black deck). Sometimes had trouble starting, then once up and running and mowing, the mower would kick off for no reason. After a lot of checking of this and that, I found I could start the tractor by turning the key verrrrry slowly right to magic point where it would connect the starter. It was very intermittent problem so it was very frustrating, it progressively got worse. At first I didn"t think the two problems were related - but they were. I found I could get the mower started by turning the key back a bit while running. Call me lazy, but I actually mowed my entire two acre lawn twice using this "fix". Very painful on the fingers - I don"t recommend it. When I finally got around to it, swapping out the ignition switch fixed both problems. Very easy fix. I pulled off the back wheel for breathing room, but you really don"t need to. Remove the two bolts under the fender that hold the whole plastic switch assembly together. (just the two rear bolts - you don"t need to remove the two front ones - it"s not obvious, but the whole top assembly is a two part ordeal) The whole top piece with the switches pops out. - Just disconnect the plug from the switch. Then on the top, use a screwdriver to pop off black plastic cap that surrounds the key hole. Undo the big nut that holds the switch in - reverse the whole operation with the new switch and you"re done. ... unless of course like me you need to file down your rusty old key so it will fit the new switch.... very easy fix.
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