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Re: 18" mower suddenly stopped working
Motor problem.if you hit something stone our water springler may be the motor magnetic ring broke & jam the armature & not
to start & house pop. see toolpartsdirect.com looks for the model of the mower. black & decker
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On these engines it's usually a timing issue or the coil. If it no longer fires but just turns over and seems to reach a 'sticking point' at the point where you think it should fire, then it's most likely valve adjustment. If you remove the plug, the engine spins over fine. But first, remove the plug, ground the plug threads on the cylinder head and turn over the engine. Is there a good regular spark? if not then it's a coil problem. Of course, it can be both problems at once as poor timing will stress an old coil and it will just stop running. Mostly there is some warning of the valves needing adjusting and that is often that it will either stop running and won't restart after around 20 mins running, but if you let it cool then it will start from cold again. This is because the valve clearances are so 'on the edge' that the expansion of a hot engine takes the valve clearances beyond the point of where it will run any longer. Here is a link to a video for adjusting valves but if you're not particularly mechanical minded then don't attempt it. https://www.youtube.com/watch?v=1-XlET33VHM
either the drive belt from the engine to the top of the transmission has broken or gone slack due to a tensioner issue, or the transmission has failed. with the engine NOT running you can put your hand up under the deck and feel the topmost belt, if it is there and snug, then you have a transmission problem and that requires a replacement.
Generally, there is an in-line fuse just to the back of the engine and on the right side of the tractor of most riding mowers but since you didn't say what brand you are working on, it is difficult to say exactly where it might be
There should be 2 wires coming off the blade clutch at the bottom of the engine and running over to the frame, check these to see if they have come unplugged or gotten cut. Also look for a fuse under your dash, I am not positive that this model has one but some tractors do have one for the blade clutch. If you don't see any thing wrong there, try turning on your ignition switch without starting the engine then engage the switch for the blades and listen for a loud "clicking" sound, if you don't hear it or it is very faint, you need to further inspect the blade clutch.