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there is a wire connected to the carby at the end of the throttle cable
that wire makes contact with the throttle plate when the engine stop is required
if that wire has fallen of or burnt through or touching the plate it will stop the engine and there will be no spark
1) Something is shorting before completing the circuit. Look for any bear wires that may be touching the metal of machine, nicks or burnt spots on wires. 2) Overload on ampherage. For more information you might try visiting the Lawnmower World Forum. They have a lot of helpful ideas and more experienced people.
Here's the scoop on the MM875: it has a plastic piece called a "blade insulator" (part # 241381-01) that "locks" the shaft to the blade, so that you can remove the nut by stopping or blocking the blade. If it has been damaged or stripped out, then stopping the blade won't do anything. However, the metal spacer directly under the nut IS still locked to the shaft (because of its shape), so you can use a pipe wrench or something to hold that in place and unscrew the nut. You might even be able to get someone in a home improvement store to do this for you. But you will still need to replace the insulator, which is only a few dollars.
You were NO help at all. I asked for a location to have an electric lawnmower repaired in my area. You gave me a source 2500 miles away. Obviously I cannot count on assistance through this site. What happened to REAL PEOPLE who can offer some intelligent reply? If I could repair a lawnmower, why would I need to ask you?